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  1. OEM Issues
    2005 GMC Envoy 4.2 I6 Codes: P0526/P0410/P0442/P0014 Having issue where at 50-60 mph range and trying to maintain speed in that range (holding accelerator steady) the engine seems to buck or jerk. Uphill, down, flat road doesn't matter. Let off gas goes away, give it more gas, goes away...
  2. OEM Issues
    I have recently cleaned the throttle body due to a poor running condition upon turning the heat or ac on putting extra load on the engine. Initially my first thought was an altenator or battery issue. So had them tested and replaced them.They are famous for the oil pressure switch. Replaced...
  3. OEM Issues
    So I have my 5.3l 04 trailblazer throwing codes for the tps and knock sensor. Codes p0120 p0220 and p0332. First 2 are tps sensors a and b. Last code is knock sensor bank 2. Any suggestions before I tear both off and replace them. If not any tips on replacing them??
  4. Engine Tunes/Mods
    Vehicle: 2003 Envoy XL SLE 4.2L I-6 Mileage: 92,000 Hi everyone - I am desperately looking for help on the rather serious REP issue. Yesterday, for example, REP manifested itself no fewer than 45 times while my girlfriend was driving it. Today, I took the vehicle for my usual 34 mile commute...
  5. OEM Issues
    I have a 2006 Trailblazer LS 6 Cylinder. I am getting a P1516 code after replacing the ignition switch. Many variables with this code. Try and clean throttle body? Battery might be a bit low but starts fine. Slightly rough idle. Checked all connections and nothing loose or obvious. Any ideas?
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