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Check for error codes (DTCs) before going any further. Sounds like a fuel problem (fuel pump, injectors, etc.) which may have been affected by bad gas. Try a good fuel additive (cleaner) as well.
Without knowing what car it is ...make. model and year this is a very vague question. A quick and dirty educated guess sounds like your timing has jumped ... if it's a timing belt, open the cover and check the timing marks ... or if it runs put on a timing light and look where the timing is ... sounds like it's firing after top dead center.
what is the fuel pressure reading, sounds like low fuel pressure, you should have 60 PSI at idle and more when you throttle the engine up about 65 PSI, it should NEVER go down.
on your last tune up you might have gotten some bad plugs i know they are new but sometimes they dont work straight out of the factory and your fuel guage connections are backwards
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