New rotor button? does your 83 have a distributer cap?:blink:Have you replaced it?It pretty much sounds like you done everything that would remove the miss,is it a constant miss,or does it just miss when you accelerate?It could b something as simple as a computer going bad,or as bad as a burnt valve...some more info on how it misses might help.Such as i asked above.Does it pop when it misses,or backfire..all info will help in diagnosis.:thumbsup: