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You have a few things to check, first off a backfire is usually associated with a timing issue, you would notice a difference in ow the engine runs, it will lack power and be rough.
Next a backfire requires unburnt fuel, so check the ignition system for problems, bad or incorrectly gapped plugs, bad wire, and if it's older look for a cracked distributor cap or worn rotor.
Then look to the fuel system, it may be getting more than it can burn.
Lastly valves, you may have a bent one, or one that is not opening or closing completely.
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