Re: Who Can Diagnose THIS Total Mystery? Win A Prize?
Sounds like no gas cap vent or gas cap vent is plugged with something. Try running with no gas cap on your standard test run.
We had a '31 on the Natchez Trace Tour last Oct/Nov that had been fighting this exact same symptoms for many months. It was the reproduction gas cap. The vent was not open.
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Jim Cannon
Former MAFCA Technical Director 
"Have a Model A day!"
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