Wow man, you got some problems. Next time you go to a dyno shop, make sure they have a wideband O2 and that you have an adjustable fuel pressure regulator, it is the only way to tune computer controlled cars. The wideband will tell them if your car is leaning out and at what rpm's, then by adjusting the fuel pressure, they should be able to fix it. If not, you may have to get your ecm reprogrammed or get some kind of piggy back fuel computer, which costs $$$. You should definetly not be beating on your car if it is running lean, cause you WILL fuck it up. How long will it take to tune your car? Depends on how good you want it, my guess would be around 2 hours and it would be pretty close. Good luck, and get your car tuned now!
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