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I have a 71 f100 p-up 302 (stock)with factory 2- barrel carb with 3-speed. The only thing that is not stock is a set of headers. My problem is that out of the blue it has started backfiring very loudly on deceleration. I mean loudly. I rebuilt the carb and checked the points and plugs. The truck idles smooth and accelerates smoothly as well. Could slack in the timing chain cause this?
 

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does the truck have a "smog pump"??
If it does and the diverter valve is stuck to send air downstream it will pop like crazy on decel. Just a thought
 

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Ding! Ding! Ding!!
We have a winner!!
A winner for what, you say.
A winner for pulling up a thread from the dead that's almost 12 years old!!
 
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