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51woodie · 03-08-2021, 05:26 PM

I would suggest you have an air leak in the intake somewhere. There could be a leak in the intake manifold gasket, or the carb to manifold gasket. If there is a vacuum line to the wipers, it is possible that it has split or become disconnected. If you can get it to idle, take a hand held propane torch, turn on the gas (don’t light it), and pass it closely around the areas mentioned above. If the engine speeds up, there is the leak.

03-08-2021, 05:26 PM	#2
51woodie Senior Member Join Date: Apr 2018 Location: Chelmsford, ON Canada Posts: 529	Re: 40 Ford Flat 8 Idle Issue I would suggest you have an air leak in the intake somewhere. There could be a leak in the intake manifold gasket, or the carb to manifold gasket. If there is a vacuum line to the wipers, it is possible that it has split or become disconnected. If you can get it to idle, take a hand held propane torch, turn on the gas (don’t light it), and pass it closely around the areas mentioned above. If the engine speeds up, there is the leak.