1970 Chevy Nova Backfire When let off accelerator

1970 CHEVROLET NOVA
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1970 Chevy Nova 4 cyl Two Wheel Drive Manual

I have a 1970 Nova with a 4-cyl and 3 on a tree. The car will back fire specifically when I let off the accelerator. I have changed the Fuel Pump, and a new vaccum. I think it may be the timing but what else should be looked into. Thank You.
Oct 21, 2008 at 5:30 PM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.
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