alrite i got a 68 dart with a 318 and ive been fightin problems with a vacuum leak and just cant get it to idle right. i have changed the intake and carb. gasket ive changed all my vacuum hoses. but when i cover up the carb while its runnin the idle goes up like its suckin from somewhere, then when im not coverin it the idle goes up and down. although ive changed all the gaskets i tried spaying wd-40 around the intake where it meets the head and also around the base of the carb, but it didnt show the signs of a leak. if you guys can help me im pretty much clueless at this point