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78SC engine problem - new info
Newly purchased 78SC with 67,000 miles
Starts up every time (hot or cold).
Runs great if accelerating, coasting or idle.
Runs great until constant speed for a while (~2 miles) and it acts like it's out of gas.
It will continue to act like it's out of gas unless idle, revving with no load or above 6000 rpm with load.
Continues to act this way until idle or off for about 10 minutes.
Then runs great again.
New dist. cap, wires, and plugs.
Valves adjusted 6000 miles ago.
Have replace fuel pump, fuel check valve, and fuel filter.
Have checked cat. converter.
Have checked for rust in gas tank and lines.
Thought it might be exhaust gases leaking into engine compartment, but putting more fresh air into engine comp. didn't solve problem.
Thought it might be a clogged tank vent valve, but running the engine without the gas cap has not solved the problem
Any guesses as to what might be wrong?
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Stopped racing and became a drummer
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