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Old 02-02-2008, 04:08 PM   #1
Join Date: Sep 2007
Posts: 19
MaineJeeper is on a distinguished road
Vacuum Leak

So my 4 banger has a rough loping idle. The tach needle constantly quivers when the engine is cold, but smooths out upon warm up. When she's hot it will lope every few seconds. I've put a vacuum gauge to it and the reading was consistent with a leaking manifold/valve seal. It fluctuated quickly between 15-20 mmHg. When I changed the spark plugs, plug #3 had deposits on it which matched up with a leaking valve seal on several charts I found.

Any input would be greatly appreciated.
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