My 1998 Mercury Tracer LS hesitates while accelerating and stalls when I stop? on 1998 Mercury Tracer

What needs to be fixed. Seems like not getting rite amount of fuel, maybe air but runs better with 89 octane. Also, I can kick in passing gear when it acts up starting up a hill, and it will come out of it and go on. No check engine lights have come on. Runs fine unless fuel gets sloshed around like on hard curve, coming to a stop, or starting up a hill, whats wrong?

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2 answers
change fuel filter if it still hesitates check fuel pressure
Water in fuei tank!