Car has been lacking power lately. If I bring rpms over 4000 it starts to break up pretty bad. Acts like it's bouncing off rev limiter? Scan tool shows cylinder 1 and 5 have misfires in the history counters. Fuel pressure is over 50 lbs and does not change when motor starts to break up. So far I have replaced plugs, wires, crank sensor, coil packs and module with no change. If anything it seems like it is getting worse. Any Suggestions? Thanks, Art.

 

Welcome to the chevrolet forum. Try posting in the general tech area of this forum for more responses.

 

Welcome to the forum. Hope someone can help you in the general tech forum.