Can anyone tell me what the difference is between the PR4 and P75 ECU. I have a 92 Integra RS which came stock with the PR4 ECU. I got a performance chip which was a P75 which doesn't run well with the car. I get some detenation (at least that what it feels like) around 3-4K RPM and it just doesn't have the power like the stock chip does. I have tried several different types of the P75 chip including a stock map with a 8000 rpm rev limit and I still got the same results. Why am I having these problems and what might be the fix