Owen_Dyneto wrote:
If the symptoms you mention occur under quite light acceleration rather than steady speed driving, they're often associated with either a ruptured vacuum advance diaphragm in the distributor, or carburetor main jets that are undersized. The latter has been a not infrequent issue since the introduction of the 10% ethanol gasoline which exaggerates the condition and on request most of the better carburetor rebuilders will compensate for the ethanol (which creates a leaner mixture) by installing slightly larger main jets. Worked like a charm on my 56 Carib which was prone to modest surging under light throttle at road speeds. You might also check the carburetor float level.
I'm not convinced your problem is the fuel pump, why not do a pressure and flow volume test?
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