Contour Enthusiasts Group Archives Forums General Troubleshooting no power after 4000 rpm

That is crazy! I just posted about this exact same problem about a week ago. Last weekend I replaced the fuel filter, cleaned the KKM filter, cleaned the TB, and cleaned the MAF. I suggest you do these things first & if that doesn't help you should look into replacing the IMRC. If you don't know what an IMRC is just do a search in the forums or check "MODS/PARTS" from the home page then select "HOW TO" & scroll down to "INTAKE(UPPER/LOWER)SYSTEM REBUILD". I was told that sometimes you only need an inexpensive gromet instead of the entire IMRC. My car has run great so far & I believe the MAF sensor was the culprit. Good luck & let us know how things go. I believe this is a pretty common problem so your info will be helpful to others.