[DAVID GAGNARD]

Been there,done that, forgot to put the pilot bearing/bushing in the rear of the crank, it'll do it everytime!!!!!!!!!!!!
Either way, you're gonna have to pull things apart to fix it........my vote is the bushing.............it's very easy to forget to put in and overlook........

My car did the exact same things you describe, brought it to a local mechanic and after he let off the clutch one time and felt it, he called right on the spot and he was right....I guess 25 years expirence will do that for you......

David