Hi guys and gals, im new to the site and this is my first post on any forum so please go easy on me lol. This is also my first modular build and i seem to have screwed up somewhere and cannot get it nailed. ive searched high and low with no luck.... very frustrated and dont know what to do. ill start by telling you what it is and what its doing. Its a 98 GT 2v. ive done a full pi swap with heads off a 2001 saleen s281 that have been ported and polished by dart heads. im running comp 270 cams, ffrp pi intake, c&l upper plenum, 75mm throttle body, stack racing CAI, BBK shorty tuned headers, stack racing underdrive, bbk offroad x pipe, flowmaster 40 out back, new factory wires, ngk tr-6 plugs and i think thats about it. know what its doing..... under a load at 1700 rpms it starts what i think is a missfire. the only way i can explain it is my exhaust sounds like a helicopter. its a thumping that i can even feel in the floor. its steady and perfectly consistant. it lessons and gets better up to about 2200 rpms and then it seems to be gone. also the sound of my exhaust doesnt sound like its coming out the tail pipes. it is loud and booming under the car and the hood, and it makes a rattling kind of sound in the x pipe, but you can barely hear the flowmaster sound behind the car. also, my intake, plenum, throttle body, and CAI get so hot i cant touch them at all. after a short drive, i cant even touch the throttle linkage to rev the car a bit. it also seems to rev really slow when warm but on a cold start it revs as fast as your foot can push the pedal. and the idle is weird. with cams i understand it should be rough and it is but it doesnt seem right. the only way i can explain it is it sounds like each side of the motor is running out of sync. it will all thump at once for a few seconds and then it will sound like a drum roll for a few seconds. and also when i rev it with the CAI off, the intake sounds choppy. ive changed plugs and wires 4 times. IAC, egr, o2s have been replaced, pulled valve covers and everything looks good. i didnt degree the cams but i checked them and there within 3 or 4 degrees. cant find any vacuum leaks. no check engine light. im at a loss and im sorry for the super long post but i live in a crappy area where it seems that nobody has any experiance with these mod motors. any ideas.... thanks in advance also i have the quarter horse and BE for tunning but currently it has a bama tune flashed with sct tuner. ive tried different tunes and that doesnt help either.