I have a 94 camaro lt1 m6. With mods like 4:10 gears, aftermaket MAF, LT4 HOT cam, lt4 knock module, K&N airfilter charger, trick flow elbow, 1:6 roller rockers, smaller pulleys, 58 throttle body, headers, no cats, loudmout exhauast. I just took my pcm to get it programmed at pcmforless. But my car is still running like crap. My cam is idling perfect from the pcmforless. But my performance dont feel right. I'm taking it for a dyno tune. Will they find whats wrong with my car. Also do you think they will give my car more horspower or torque. Should I even get it dyno tuned. I mean I already had my pcm programmed from pcmforless. Any body here ever got a dyno tune. What actually do they do. Do they replace parts on your car or change settings. Can they do allot to a lt1 engine. I'm just hoping if they put it on the computer they can tell me what I need to change to max my performance from my car.

 

For starters try a stock MAF, the Granatelli is known to cause drivability issues especially when combined with aftermarket reprogramming. I have gone into the details about this before and have relatively few posts here so you should be able to find an explaination. Basically it is probably too lean at hard throttle right now.

 

Well the problem I'm having right now is when I drive under 2-3k my car starts to make the loud popping backfire sound like cherry bombs and it feels like thats affecting my performance. Do you really think by changing my MAF. My car will perform better.

 

The stock tuning is very rich, the granatelli tries to trick the pcm into running leaner(closer to opimal) by misreporting the airflow, the aftermarket programming it set at least very near optimal so when you combine the two it gets too lean. This is very likely your problem, at least try your stock MAF or borrow one to try out my theory on your problem.

 

pcmforless programmed it to read a porter screenless maf - still try a stock MAF YOU THINK?? - Do you really think my car can miss cause of that problem