03-17-2010, 08:05 PM
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CC Member
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Join Date: Jan 2008
Location: Williamsport,
PA
Cobra Make, Engine: Kellison Stallion 468 FE
Posts: 2,703
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Not Ranked
if you can verify the vacuum gauge is in correct working order, i would question the needle bouncing, how much is it bouncing, is it more than 1 in vac.your experiencing run on after the key is turned off. where is the timing set? is there fuel dripping into the plenum from the carb without moving the throttle? a fluctuation of 2 or more inches of vacuum can be a sign of valvetrain issues. broken springs or bad valve guides can cause a vacuum reading fluctuation. not trying to be an alarmist, and i have no idea how new or old your build is, but there seems to be more going on than having to adjust the carb.
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