95 gustang

i just recently got my car back after putting in a new distributor and fuel pump. it was running great for about a week and then yesterday it started acting funny. in the morning when its cold, when i am driving it the rpm's will jump -go from 1800 up to 2100. also it feels like it is bucking when i am driving it, not terribly bad but it feels as if i were letting off the gas really quick then putting it back in.. this is driving me nuts, let me know if you have any idea what is goin on

silver91gt

check your coil terminal for corrosion

galuszka01

yea that sound like coil terminal corrosion

2oo5stang

do check your coil and check at night cause if you see a small looking flame around themetal bracket that goes around your coil, it's bad. happened to me and my car was running like crap and like it was missing. also check your plug wires since you had to mess with them and make sure non are resting on your exhaust manifolds. one could melt and start arcing causing the spark to ignite the cylinder to go somewhere else.
also fuel pumps are electrical and electrical crap can crap out, even new. a slow or weak pump can make your car run like crap sometimes depending on how you are driving, do u have a fuel pressure gauge to check?