In addition to the symptoms the others note, a non-functioning vacuum advance can cause the engine to backfire out the exhaust when the throttle is suddenly closed from governed RPM.
Check by sticking on a timing light then noting the timing mark location with the engine idling. Now disconnect the vacuum advance hose and check it again. If the vacuum advance is working, the timing will mark will retard noticeably when the hose is disconnected.
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Today's Featured Article - Old Abe is Still Making Hay - by Jeremy Sweeten. Things have changed a bit since my last article. I am now almost finished graduate school at Purdue University. I am still in Agronomy, but specializing in hay and forages. My wife has survived two years of marriage to a part-time farmer. The equipment line up has changed a bit too. The DC has retired to
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