So, I have a 95 sport with 146,000 miles on it. I have put a cold air intake on it with a throttle body spacer, new dynomax full exhaust, magnaflow cat, new tps, iac, fuel filter, wires, plugs, cap, and rotor just last year. Last month it started with a small miss at idle. So I replaced the cap and rotor since it looked alittle worn. That seemed to work only for about a week and it started again and seems to be getting worse. Any ideas?? I was thinking pehaps the o2 sensor. Not sure though

 

Check for codes? The O2 sensor really just sends rich/lean info to your ECU which then determines how much more or less fuel to give it. In any case, with that many miles on it, a new O2 sensor is a good idea. With all the newer parts you already have, I'd check for vacuum leaks. Spray a few short blasts around the throttle body, hoses, intake manifold etc. If starter fluid gets sucked in, you'll hear the change in idle.

 

Spray some throttle body cleaner around the intake with the engine running. You may have a vacuum leak. You'll be able to tell when spraying as teh idle will change immediately.