[Silverback51]

Had this happen to me a couple years ago, and I replaced the everything. By everything, I mean the cap, rotor, finally the complete distributer, plugs, wires, coil, MSD box, and it still ran the same.

I was ready to load it on a tow truck and have someone fix it and call me when it was done.

I was talking to an old friend of mine and he mentioned that the MSD unit is very sensitive to voltage input. He suggested that I disconnect the alternator and try it. I did and it ran fine. Put a new alternator on it and it did the same thing. Come to find out it was the voltage regulator. Replace it and it ran fine.

I did however end up with great collection of spare parts.

Take the belt off of the alternator and see how it runs.