My small-port 3100 developed a rough idle and sounds like it's aggressively cammed (oh how I wish it were true). Only happens when the engine is idling, in gear or not. My vac/boost gauge is reading a few inches of vacuum less than usual but the RPM is a little lower than normal and sometimes borders on stalling. During acceleration or cruising the engine runs fine but there is a noticeable drop in low-end power.
Any ideas? I thought vacuum leak at first but that usually results in a high idle. Thanks in advance.
Any ideas? I thought vacuum leak at first but that usually results in a high idle. Thanks in advance.
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