FAJS 48 DCOE Side draft (Weber Knockoff) carburetor on 1985 GSL 12A 5 speed manual that pops as I drive along. It does the popping less when the motor is cold. When I accelerate, the popping occurs and the carburetor spits gas out through the air horns. Any thoughts on what is wrong with carburetor?

 

Back fire thru the carb makes me think its timing related.Is your dizzy loose?

 

I will check although, I have not touched the Dizzy.

 

Compression test it. The only time I’ve ever seen a Weber backfire out of the air horns are when they’re blown.