help rough idle, missing

[PNYXPS66]

Has anyone thought about correctly checking the timing on these cars? You must check the timing WITHOUT the emissions control computer hooked up (this is BASE TIMING and the specs are located on the VECI label located inside the engine bay). If Stellar Saleen's base timing is at 12 degrees, then when the computer adjusts the timing, the cylinder isn't firing until almost 24 degrees after top dead center! That means there's no compression to make power. This will also cause missing and other problems. I'm sorry if you bought another head Stellar, but it wasn't worth it unless you were overheating and/or losing coolant through the tailpipe; having the old head magnafluxed and checked for cracks (about a $10 job at most machine shops!).

Good luck guys.