Engine buck

[Nick_e30]

Car feels fine until around 3500/4k rpm then it'll buck hard it's hard to explain. It'll buck like it loses power for a moment until I let off the gas i can see the tach bounce and the check engine light will flash for a moment. Usually happens in 2nd or 3rd gear. it used to happen once in a while now it's getting more frequent. Any suggestions?

[Swanny]

Possibly your afm. One of my earlier cars had a dead spot in the potentiometer which caused severe bucking, eventually the whole thing died and it refused to idle as well.

[Kershaw]

does it happen under normal driving or only at full throttle?

Either way, go through this thread. All the diagnostics and parts you should check are in there. http://www.r3vlimited.com/board/showthread.php?t=372569

[Nick_e30]

It'll happen at anything over about 50% throttle. I know my timing belt is way overdue could that be related?

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