Hi All, New to this site...lots of great info here. I did some searching, but can't find an answer to my question. I bought an '06 GMC Envoy XL and only drove it 100 miles before the check engine light came on with a misfire on cylinder 6. Diagnosed it as a bad lifter (AFM) and observed the...

Hi everyone, Before I get to my problem here is a little background info on the vehicle. It is a 2006 Trailblazer 4.2 LT2 with 200,000 miles. I have owned the vehicle for 9 years and up until recently I have never had a problem. I stayed up to date on all regular and recommended maintenance. No...

I have been sitting on this problem for a while now and reading horror stories about the lifter/AFM/replacement engine costs so I finally decided to start investigating the problem to see what I could find. My engine is only misfiring on cylinder 4 so I have changed the plug (have the others to...