OK i have the whole LT4 cam and springs. RR. and on the Scan Tool the car is showing Misfire's some are rolling and some are random misfire's. So the question is do cam shafts cause a faulse misfire or is the car actually misfireing under a load misfires seem to stop.

 

The Lope is what causes it from what I'm told. The pcm sees lope as an erratic crank rotation, in other words, a misfire. You can adjust the random misfire parameters in the PCM to only come on a certain RPM or so to prevent the light from coming on.

 

I have the hotcam on a stock tune right know and the Tech II isn't showing any misfires on my car.

 

hum well the opti just went out too so it might be a little bit of both playing with the TECH2. Keep the info comming thanks