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On a vehicle that is an older car, most likely with higher mileage, you more than likely need to replace the O2 sensor, (oxygen sensor). This will increase your performance,and, as well you will see a positive increase in your miles per gallon.
If it is running rough & no check engine light on then the first thing I would to is tune it up. If you have a check engine light then pay someone to diagnosis it & go from there. Usually when the light comes on there is a more promenient issue; that is WHY the light continues to flash.
I am assuming you have a Pontiac Grand Am. You would need to have someone scan the computer for trouble codes to proceed. The codes will point you in the direction of the problem but not tell you what to replace or repair.
HOW MANY MILES? Where/ how has vehicle been driven: (loads of miles in in dusty conditions?) have you checked for a plugged fuel filter? or tested the fuel pump? inspected wiring to the fuel pump? how about the gas cap -- seriously! there could be a vapor lock going on... is this random or is there some pattern to when it cuts out? (say after so many miles etc?) Ck
if you run a car out of gas it is sucking what is on the bottom of the tank sometimes things you dont want .. the filter is designed to catch this type **** .. I would change the fuel filter first before anything else because this is your cheapest thing to do and logical thing to do first ..