Mattn

I have a problem where my 02 trans am all stock will just misfire when I am in bginning of a pull around 55-65 and it doesn't throw a light either.I had new plugsplatnuim,wires.new fuel filter.I cleaned out my air filter Mass aroiflow,throttle body.i figured also since its only does this like once every couple of pulls not even then sometimes it runs fine.It also will just clear itself up.Anybody got tips.Can it really just be carbon build up