What year truck and what engine?

If it has hydraulic lifters it could be that one of them has leaked down While it was sitting around. How long did you let it run after you started it?

Could even be an exhaust leak.

Last edited by Otto Skorzeny; 05/20/2023 10:02 PM.
1950 Chevrolet 3100 (Ol' Roy)

1939 Packard Standard Eight Coupe (The Phantom) | 1956 Cadillac Coupe de Ville (The Bismarck) | 1964 Ford Galaxie 500 coupe |1966 Ford Mustang (Little Red) | 1969 Pontiac GTO (The Dishpit) I 1979 Ford F-100 | 1976 Ford F-150 (Big Red) | 1995 Ford F-150 (Newt)