remember how i was half joking about checking the booster for any vacuum leaks?  (i'm assuming that u have power brakes)--crimp the hose going to the booster and see if your idle drops--while u r at it, trace the hose all the way back to the intake to make sure it isn't split, etc--u can also press the brake pedal w/the engine off--should have 1 or 2 assists and then the pedal gets hard--if hard pedal as soon as engine is off, then there is an air leak somewhere--just another shot in the dark since i'm assuming u only pressed the pedal once (if u press it multiple times real quick it will affect the idle on pretty much any gasonline car w/vacuum brakes)......and fyi, the worst thing to do is throw parts at it, unless u have known good ones laying around that are free....besides, i'd hate 2 c u have to drive a chebby