If its not the gas and it is not a vacuum leak from the wiper motor, then it is time to break out the timing light and see if the needle is on the ball (5 degrees BTC). The wrong timing will cause a backfire.

Last edited by 52Carl; 09/06/2024 1:44 AM.
1952 5-window - return to "as built" condition | 1950 3100 with a 235 and a T-5 transmission