[427sharpe]

Ck timing--may be too advanced. If you don't have a timing lite try the old way. TURN OFF MOTOR, loosen the dist holddown just enough that you can move the distributor with a little force, and make a small mark on the base of the dist where you can see it, and at least 1" away from the holddown. Start motor. Turn distributor counterclockwise until the engine starts to fumble and make a mark on the block @ the point where the dist is marked,than do the same in a clockwise rotation. Turn off the motor. Put the dist in the middle of the 2 marks on the block, and tighten the holddown. Ck and see if your problem is gone. Hope this helps!