Question about 1981 Ford F 100
It sounds like you have covered the basics. Fuel, spark and compression are all that are needed. I would start by looking for a vacuum leak either between the cylinder head and intake manifold or at the base of the carburetor.
Use a can of carb cleaner and lightly spray at the intake gasket area of 2 and 3 and see if the idle smooths out. Also spray at the carburetor base on the side near 2 and 3 to see if the idle smooths out.
If that is unsuccessful, you may have to consider the intake manifold gasket has burned through between the exhaust heat riser port located between the two.
There is a tendency over time for the exhaust to deteriorate the gasket in that area or the other side, 6 and 7.
Consider it and let me know.
Posted on Jul 21, 2009
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Posted on Jan 02, 2017
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