ok i have 91 z28 305 automatic, after the car warms up it starts to run like crap thie idle goes up and down, than it will seem to fix itself for a few seconds and start doin it again, i can even feel power surges while driving, that has just started recently. has anyone experienced this problem, i amd thinking posible the TPS. i have chnaged all ignition complinents except the pick up coil and distributer. if i put the car into neutral at the light the idle gets better but still not 100%. and help would be greatly appreciated.

 

TPS, not sure if you have an IAC motor or not, O2 sensor, it is not tune up related. also might be a fuel flow issue. What color were your plugs?

 

well i did a TPS sweep and that checked out fine, i do have an IAC motor, the O2 sensor voltage stays between .49 and .52 volts and moves very slow. i still have to ohm out the injectors