strange miss

[boostx]

My friend 87GN has a strange intermediate miss, this is the problem the car drive fine 15psi of boost no problem cruise for about a minute get back on it and it wont rev out and black smoke then it will run fine and wait a few second and try it again
its fine
We have change TPS, MAF, COIL and ecu
any ideas

 

[onefastjackass]

Whats his fuel pressure at??