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Again check the TPS. If you have a digital volt meter you can do this yourself. You need to pierce the GREEN wire with a small probe (a small safety pin works great) and connect it to the positive lead on you meter. Then connect your negative lead to a good, close ground I.E. the EGR spacer. Next turn the car on but do not start the engine. Check your voltage reading, it should be around .98v. Then, with a free hand, slowly open up the throttle all the way. Your volt reading should be smooth as the #'s go up the scale. If they jump around in cretin spots then you need to replace the TPS. Good Luck J.P.
try cleaning the mass air see if that helps but more than likely it will be timing. Bring the motor up to top dead on cylinder 1 and see if the balancer slipped. It has been known to happen. Butr i would check the mass air first, its easy to clean and they do cause odd ball crap to happen