7
77vette
Guest
This may be hard to understand but i'll try to explain......My 77 vette L48 a/t makes a hissing sound somewhere in the engine when it shifts from 1st to 2nd and again when coming out of passing gear. It sounds like air is being sucked in (or out). It is a very brief hiss but noticeable. Could it be a vacuum hose leak? I'm baffled...:confused