I have had a similar problem the unit backfired so hard on acceleration it blew the air cleaner apart unit came with a woodward carb system I changed it over to impco "cobra & mixxer" changed plugs wires cap rotor ign module and coil still does it a little bit I am thinking air pump @ this point?
This is ONLY to be used to report flooding, spam, advertising and problematic (harassing, abusive or crude) posts.