You can adjust it by pulling up the pedal and placing something over the part of the pedal that touches the cable (get under the dash and fool around with the gas pedal, you'll see what I'm talking about). I used a 3/4" nylon spacer. Some people just use part of a bic pen.
It's really easy. Just get under the dash and lift up the gas pedal. You'll see the space it creates between the pedal and the end of the throttle linkage. That's the space you need to put a spacer on
2002 Mineral grey GT 5 speed. Flowmaster 40's catback, Mach 1 grille delete, timing advance, push button starter, Bullitt pedals, FR500 steering wheel, K&N FIPK, Self ported upper intake w/ spacer, Pioneer Avic D3, MGW shifter, MM FL subframe connectors, Mach 1 springs, Bilstein HD struts/springs