i can drive the car anywhere took it to the beach today ft lauderdale nice day but when i try to get on it i can't get it past 5 lbs of boost sounds like intake pops ,like i said car runs great till under boost changed plugs wires coil and mod checked with caspers tester. reset the cam sensor .put a new gas tank in with a different pump check and fixed any vac lines that looked bad my blms 124 and int128 .the moter came with a heated o2 sensor kit from caspers i replaced the sensor i replaced the wideband sensor also . just for the hell of it i put the one wire o2 back in but the car would not even start , so i put back the 4 wire heated one back in it started right up but still had the problem under boost .i have posted about low o2s and after warmup thinking this is part of my problem thats why i replaced the pump and put a new gas tank in with the baffle .the tank that was in there didnt have a baffle .the only thing i didnt change was the fpr it has the stock looking one with the billet top . i got alot of suggestions from the guys that know there way around these cars from this site you guys know who you are and i really am greatful .but man i just cant get it right what about crank censor ? sorry sorry and sorry about the long post but getting fed up and thinking about putting my big block olds rocket motor in but really want to get it right thanks .