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rough idle

  1. Rough idle while a/c on at stop light

    General
    OK, I bought my 2007 TB new and now have 189,760 mile on her. I am a traveling acct mgr and live in my truck. By far the most durable vehicle I have ever had. Never been alighned, average 88K on tires, ran mobile 1 5/30 since 15k, Royal Purple in rear dif. Short of normal maintaince, I have not...
  2. Rough idle, got worse, thought I wouldn't get home!

    OEM Issues
    This was when I discovered this forum. There were a lot of ideas on what it could be. I changed the air filter, problem solved. Not dissing this forum, it has saved my bacon a few times, I love it, just thought it was funny.
  3. Several possibly related symptons?

    General
    I have a 2003 Trailblazer LT 4.2L I6 with 153,000 miles I am experiencing several symptoms that may or may not be related. Here they are: • Frequent strong fuel smell outside the car • Not all the time, but often, the car will not start. It will turn over, but not start up. If I tap the...
  4. Intermitten Misfire / Rough Idle

    OEM Issues
    I have been dealing with a misfire code for a few months that only occurs if the truck has been idling for a few minutes, finally got around to working on it a bit. This is what I have done thus far. New spark plugs 3 new coils including the one on cylinder 5 (the cylinder throwing the misfire...
  5. Rough Idle / How do I Check a coil? / TCCM

    OEM Issues
    Hello everyone, and thanks in advance! '02' Envoy SLT 4.2L I-6 90,000 (bought it from my sister 2 yrs ago it's been babied) And I Love it! I've had some common problems. Battery went dead shortly after I got it. It set the "service 4WD" light Installed new Battery, tried all the tricks had to go...
  6. New motor mounts, followed by new vibration

    OEM Issues
    I changed my motor mounts recently. That did the trick as I had the dreaded drive gear vibration. The passenger side mount was torn almost completely around its' circumference about an inch from the top stud. Fast forward to about two days later... I now have a vibration that's different...
  7. Replaced the CPAS and now runs horrible!

    OEM Issues
    Hi, my name is David and this is my first post on the forums. I wish it wasn't because of this problem. I know there is a wealth of experienced owners here so I hope you can help me figure out my issue. A little background. I own a 2003 GMC Envoy XL with the 4.2L 6 cylinder at about 148,000...
  8. ses light blinking, misfire, rough idle

    General
    Hi, this is my first time posting here. I own a 2003 envoy sle with 120k miles, regular maintenance. I love this truck. It's great in the snow. Recently I've had a problem with the ses(service engine soon) light blinking, a very rough idle and when my guy put it on the computer code s0300 came...
  9. Rough Idle

    General
    I have a 2003 Envoy and am experiencing a rough idle when the vehicle is in the drive position but when in the park position you hardly even know the engine is running. What gives with that? Anyone ever had that issue? Rick:thx
  10. 2003 - Rough Idle

    Engine Tunes/Mods
    Looking for a little assistance here. My Trailblazer seems to run fine once I am moving but the idle is very rough. I have done a lot of reading and so far have cleaned the throttle body and still have a very rough idle. I purchased a fuel filter but can't seem to locate the filter, picture...
  11. Battery Impact on Engine Performance

    General
    I took my 04 TB into the shop because the battery would go dead if not driven for a couple of days. Prior to this, I was experiencing some performance issues (rough idle, lower fuel mileage, shifting at higher RPM in low gears, etc). I think the battery might have had a bad cell (brand new 6...
  12. [SOLVED] 2002 won't start hot, bad idle

    OEM Issues
    I have a 2002 trailblazer. In the morning, and after work, it starts no problem. After I've been driving around, I have to let it sit and cool down for at least an hour before it will start again. If not, it will try and turn over, and eventually (after 10 mins or so) it will start. This...
  13. [SOLVED] 2006 TB Check engine: misfire cyl 1???

    OEM Issues
    I was taking my girlfriend out for our anniversary (starting good huh?) when I fire up my 06 TB and it started sputtering and jerking in idle. Issues were similar while Oscar Mike .Tried running through last tank of gas then filled up with "89" to see if the quality of fuel was a problem but...
  14. Vibration on mild acceleration, or sometimes idle

    OEM Issues
    2003 4.2 IL6 cruising on flat roads, slight acceleration, or sometimes just idle, the TB has a sluggish feeling and a definite lug or vibration felt throughout the vehicle. You can feel the vibration mostly around 1500RPMs. The vibration only is apearent when accelerating slightly. It starts...
  15. Starting Issues, Check engine Light, Reduced Power Light

    OEM Issues
    Hello All, Have on 06 Envoy with a 5.3l and 52k miles on it.. About 2.5 weeks ago I put Chevron fuel as usual, however not from the same place. I drive for a 3 miles turn off the engine. I watch a ball game, when I come back the engine wont start. I turn the key to the start position but...
  16. Stalling at Idle or Rough Idle - Read This First!

    OEM Issues
    If your (circa 2004) TrailBlazer/Envoy has 80-100k miles on the odo and your symptoms are stalling at idle or rough idle (stop lights, stop signs, parking lots, etc.) and you find yourself driving 'two-footed' to keep it from dying on you, then please read on. Based on past experiences with my...
  17. Sluggish on mild load and sometimes rough Idle

    OEM Issues
    :bonk: I've searched the site extensively, Completed all suggestions/recommendations. Big issue is when driving under mild load conditions. i.e. cruise on flat roads, slight exceleration, or sometimes just idle, the TB has a sluggish feeling and a deffinate lug or vibration felt throughout...
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