In addition to what's already been mentioned, a clean fuel filter allows more volume of fuel to travel through the lines and to your throttle body which in turn gives you a little more throttle response.
When you remove the old fuel filter, blow into the intake side. Then blow into the intake side of the new fuel filter. After doing this, if it's been awhile since the filter's been changed, you'll understand why you should change your fuel filter regularly.
Anytime you buy a used car the first thing you should do is change the air and fuel filter as well as changing the oil
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Bobby
Died 5/1/08, resurrected 5/15/08
ASCD SD hood, 17" Bullitts, Overkill PCM, 3.4" Pulley, NGK TR55IX, K&N 9" cone filter, JimmyC D/P, U-bend removed, Flowmaster 40 series, Hooker big bore tips with resonators, S/B brake lines, drilled/slot rotors, GMPP handling kit, KYB struts, F&R strut supports, HID's, LED's, 2.5" Air Dam, red GTP overlays on custom badges, white rear insert.