Hey. I just bought a 1987 gl sedan a few days ago, with all intentions of lifting it and such. I am trying to get it running first off, and i bought it knowing it had this problem. The car hesitates. You can get it going, but when giving it anymore than about 1/4-1/2 throttle, it will rev up to about 3000 and then hesitate, sounds like it might be missing even, but at this mark it runs pretty rough and cuts out. If you feather the throttle it will eventually rev up past 4000, where it seems to run fine. Idle isnt perfect but vould be better. The guy I bought it from put a brand new carb on it, new fuel filter, fuel pump and ignition wires. We took it and redid the timing, thinking that was the issue, and it didnt help. We also changed the distributor with no effect either. We've checked all of the vacuum hoses we could think of as well as bellows in the vacuum system. Nothing has made it run like it should. What else could it possibly be? We are stumped.