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  1. [SOLVED] *** urgent please help ***

    OEM Issues
    Hi. I have a 2004 gmc envoy with CAI and highflow exhaust, The envoy has just started to mis-fire extremely bad, its not in limp-mode but misfires badly on acceleration and every 5-9 seconds at idle. engine even shakes a little. I've tried seafoam treatment and nothing. I think I can hear a...
  2. knocking in the morning

    OEM Issues
    I have an early model year '02 Trailblazer LTZ, it now has about 100,000 miles on it and has the 4.2 I6. The issue I am having wasn't there when I bought the vehicle a year and a half ago (with75,000 miles on it). This just started this winter, when I start my vehicle in the morning i hear a...
  3. Knocking sound

    General
    On my 2004 Envoy XL, there is a knocking or tapping sound for 15 to 25 seconds, after starting the engine. It does not happen all the time, but mostly on cold start. This sound is coming from the Passenger side rear of the SUV, behind the 3rd seat and underneath the side window, and behind the...
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