if feels like its either not getting fuel all of the time or the spark timing is being retarded randomly...using the butt dyno the power graph feels like a sine wave. but not abruptly enough to be a missfire.

http://www.hasdeu.bz.edu.ro/softuri/...ves_4/Sine.gif

...its worse when its warm. i have changed the ICM and the FPR and checked the TPS. i have checked the timing, changed the plugs, and checked compression. also changed the injectors. i dont have a gauge to check fuel pressure. it idles fine, no surging or anything. fuel milage has dies to about 30 (down from 40). when i do try to put down some power to pass someone, a) i cant b) it smokes a lil tiny bit above 4k. no check engine light. it seems like whatever it is is getting worse every day. any ideas? thanx

 

up...also changed the fuel filter with no effect.

 

BTW if was the coil crapping out...it would spark everytime but every few rotations it would throw a weak spark. this got worse and worse until the car would barly drive and it never sctually missed. swapped in a friends coil and it was like a new car again.