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JFairman JFairman is offline
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Join Date: Jul 2006
Location: S. Florida
Posts: 7,274
If it's not misfiring while hesititaing I'd check the origonally red fabric covered vacuum advance line at it's 4 connection points from the top of the throttle body to the small thermal valve on the breather cover and the distributor advance pot itself. That is if your car has a later USA distributor with the advance and retard pot. The origonal red fabric covered vac advance hose will dry rot and crack under the fabric after 20 years so you can't see a leak in it either so replacing it with a new red silicone vac hose is inexpensive and a good idea.

When these motors don't get any vacuum advance from a dead start all you have is centrifical advance which starts later and advances gradually with rpms.
It's ridiculous how sluggish these cars will be at low speeds without enough ignition advance.

If you don't run a catalytic converter than do your car and yourself a favor and bypass the thermal valve in the vacuum advance line because it's only purpose is to block vacuum advance during cold starts and cold motor running conditions so the ignition timing is retarded causing the exhaust temperature to be higher so the catalytic converter heats up faster.
Old 12-02-2009, 02:17 PM
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