Had a huge vacuum leak last year, truck would run only with choke pulled out. Vac. fitting at carb was loose. The vacuum gauge is a great tool, hook to intake, should have 16 to 18 reading, steady not bouncing needle. I like to adjust carb and set timinq via the vac gauge. You can spray Barrymans Chem tool around intake and carb with motor running, if speeds up you've found your leak. BE CAREFULLWITH THIS STUFF!!!

If all else fails go back and adjust valves, but not to tight.


It's easier to get forgiveness than permission!
1946 1/2-Ton Chevy
1953 Chevy 3/4-ton Factory Stakebed