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Message: <blockquote data-quote="Dave1234" data-source="post: 141532" data-attributes="member: 23099"><p>I would be suspicious of a vacuum leak first--PCV valve, vacuum line, loose carb to manifold nuts, bad carb to manifold gasket, bad manifold to head gasket or loose bolts there.  If the intake is somewhat far away, try spraying brief squirts of brake cleaner near/on any potential leak area and listen for change in RPM. If the intake is too close, it will be very hard to tell if it is sucking in the fumes there vs through a leak.  Other than the PCV valve, other leaks should have shown up worst at low RPMs/high vacuums requiring idle mixture adjustment or increased idle speed screw.  Possibly a problem with the carb rebuild--low fuel level/incorrect float level.</p></blockquote><p></p>