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  1. The 02-09 "How-To" and DIY Section
    I am new to this site. I have checked it out before and thought this would be the best place to look for help. I have a 2002 Envoy. It started missing, I changed plugs and replaced all coil packs. still have a random misfire. The CEL is on and flashing. I know that I can't drive it...
    check engine light help help help random misfire
  2. General
    Hello all! I’m hoping some of you can help shed some light on my issue… The water pump on my 2003 TB 4.2L 4WD (145k mi.) developed a leak, so we changed it out and at the same time changed the serpentine belt. When we got it back up and running again, it was running slightly rough and would...
    random misfire rough idle throttle body clean
  3. Engine Tunes/Mods
    Hi everyone. First I want to thank all of you for this helpful site; I’ve been saving so much time and money with your help. Two months ago, I got a permanent Check Engine light on, PO300 “Random Misfire” with a poor idle; after reviewed some of your posts, I cleaned my throttle body, change my...
    po300 random misfire sls light spark plugs
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