I had the same problem of backfiring after I adjusted to eliminate pinging. BUT my gas mileage is still way off. The road mileage average drop from 20mpg to 15 and the in town dropped from 15 to 10mpg. They think it is the rear carb. Hope to figure out by Sept, KC trip. Frustrating.


Ron, The Computer Greek
I love therefore I am.
1954 3100 Chevy truck
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2017 Buick Encore
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1960 MGA Roadster Sold 7/18/2017