when your car misfires it dumps fuel out the valves that didnt get burned and it burns up in the exhaust and backfires.
id check everything along the lines of the PIP (proper ignition pickup) which would mean everything in the ignition system....from the coils to the cam sensor to the crank sensor and back again.
sounds like you need a DVOM and start testing voltages and resistances of your sensors...unless you like throwing parts at a motor
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