1971 cougar with 302, all was good until i cleaned the carb, its a 4 barrel holley. I sprayed the barrels with carb cleaner and now I have this issue whenever I stop at a light it sputters and dies. When trying to start i have to mash the gas to even get her running. If i let off it it will sputter and die. It sounds like when it dies, theres some kind of loud vacuum noise. Any idea?