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  1. General
    I have a 03 GMC Envoy with about 110,000 miles on it. I know the fan clutch is bad and its been ticking for a while. The motor just started knocking here lately. It will start up no problem and idle smooth as glass but it will knock and has no power. It almost seem like its holding its self...
  2. Engine Tunes/Mods
    Ok so my question is ," Is there an aftermarket variable valve timing controller" available for the 4.2 i6? I was told by several GM techs that a vafc will do the trick.... As well as greddy "e-manage"/..... I know that alot of the vvt cars severly benefit from a controller,,,,, One of my...
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