Originally Posted by
manorchurch
= rough idle. Spray vacuum pump oil on the manifold gasket seams -- not carb cleaner. It stops up leaks for a few minutes and smoothes the idle before the oil gets sucked in and burned. Rough idle, imho, is rarely a vacuum leak in the manifold and carb mount. Whoever mentioned refreshing the vacuum lines is right -- but sometimes it's one bad plug wire. Little bit of arc-over through the cable insulation, little bit of miss. You can usually see the spot at night when lights are out.