There are actually a few things this could be. you really should invest in a diagnostic tester (about $25 at auto-sone or NAPA) and read the trouble codes coming from the PCM of the car, to make sure its not an electrical problem or a sensor.
it could be anything from a fouled spark plug, to a dirty fuel filter, or a bad sensor.
my advice would be to disconnect the battery from the car for about 30 minutes, and the connect it again, and see if the issue is still there. remove all of your spark plugs, if you can, and inspect them....replace them if necessary, also check the spark plug wires as well for any burn spots, dry-rotting / cracking.....if they look really aged, then it might be beneficial for you to replace them as well.
you might also want to consider using super octane for the time being with a healthy dose of fuel injector cleaner, on every fill up, using atleast but no more than 2 jugs per full up, but put the cleaner in BEFORE you put the gas in. if the car still has this issue afterwards, you might consider having someone with mechanical knowledge to inspect the car themselves.
Without more to go on its a BIG guessing game. A shop wil have to diagnose this. I would start by checking the exh for back pressure.
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