I have a 94 camaro z28 my car drives perfect when i first drive it once it warms up car idle up and down?

i already changed the throttle body and the throttle control sensor and i dont have a check engine light on
I have a 94 camaro z28 my car drives perfect when i first drive it once it warms up car idle up and down?
IAC motor, PCM malfunction, TPS, exhaust restriction, vacuum leak, on and on...