Msd box ?


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If you have an open in a plug wire or a cracked spark plug you would be having a miss all the time. If your only having this in the higher rpm range, it could be a possibility that your valve springs are getting weak or even have a broken one, check them all very closely, maybe it’s time to change them, springs only have so long of a life, heat and duty cycles will cause the coils to weaken.

When you changed the distributor, did you use the same cap and rotor?

How is the power wired to the distributor? Is there a relay? Or are you running straight from the ignition switch?

Voltage drop will do what you are saying, not enough spark to keep stuff lit.

Grab an inexpensive fog light relay and wire it to the distributor at the engine using the ignition wire from the switch to energize the relay and run a wire from the battery (or solenoid for the starter or other hot source) with a 12 gauge wire and the other side of the relay to the distributor....


GT

Vacuum secondary? Gummed up with what?

GT