pontiac......help!!

hi there, i've got a 95 pontiac grandprix thats hurtin'. im pretty sure its the fuel filter or pump. but im not totaly sure, and dont know much about cars. so the engine cranks, but it wont turn over. so its
been sitting for a few days and i decide to give it a try. i turn the key, hear a little something(other than the endless cranking) i stomped the peddle and bam! it started up. but i really had to give it some gas at first to keep it going. i drove it around the block, parked it, turned it off and restarted it fine. hour later......nothing. this morning, nothing. this afternoon.....it almost starts like the otherday, but i didnt get on the gas quick enough.
so any help would would be greatly appreciated.
thanks
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