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Originally Posted by RICK LAKE
If you have a propane torch and get the car running at idle, hook a hose to the end of the torch and use a small end on the hose like a tire inflator and run this around the base of the carb. If the idle of the motor or the motor smooths out, you have a leak. Rick L.
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KABOOM! I would never use a flame next to a running carb. Just spray the area with a little starter fluid using one of the small red straws to pinpoint just a little fluid at the areas of a suspected vacuum leak. If the idle increases RPM, you found the vacuum leak.