Originally Posted by PaulS
Checked, and the vacuum line ports directly into the intake manifold--specifically, the flow passage to the #4 cylinder. What would be the effect of a vacuum leak there?
Normally the engine runs lean on all cylinders because of lack of vacuum which ups the RPM and can burn a hole in the leanest piston, #4, if you let it go on too long.
The only tricky part is if the last owner set the carb mix and idle speed up 'with' the leak present. The setting will be off after you fix it if this is the case, so if the idle drops too low you have an idea of what to go for.
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