Alright boys and girls here is whats up. To start its always good to put in a little info.
The car is a 95 Z coupe auto
Mods: LT headers, no cats, y-pipe magnaflow exhaust, K&N cai, shift kit
Recently replaced parts: Spark plugs, wires, cap&rotor, fuel pump, ignition coil

Finally the problem: The car hesitates/backfires/misfires at high rpms. Its really noticeable when im at WOT shifting from 2nd-3rd and 3rd-4th. From
3rd-4th it will almost just sit at 5000 rpms hesitating to shift like its not advancing at all. I dont know if you guys understand ill try to post up a video a little later.
Musch thanks in advance any ideas or help will be greatly appreciated