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if it only backfires when shutting off, usually this means its getting to much gas!! if it backfires will running adjust carburater.
I'd check vacuum hoses first. Then check to make sure the idle adjustment on the carb isn't offset.
Not enough gas in the tank and it sloshes to the back!
Check your EGR valve
Does the gas pump keep shutting off ? If so , try putting the gas pump nozzle all the way in and then pull it back about 1 inch . A gas station attendent told me that when the gas pump kept shutting off when I was trying to fill my Ford Explorer gas tank , it works for me
Maybe youve got a stop/start engine BY AP1
It could be something with the pump itself, or you are going over the limit in what you paid for gas.
Re-launch the Pandora app and press the stop button.
Anything apart from unplugging/shutting off all the appliances would be considered fraud.
Check all vacuum hoses first. If they are all attached & in good condition: Check that the air filter is not severely clogged/ dirty. Replacing the gas filter (s) may also stop this from happening. My bet is on the gas filter (s) or the vacuum hoses.
There is a safety valve in the car, so when the gas tank is full you here the click of the valve shutting off
By shutting off the gas supply draining down the tank removing all the connections