(Also posting this in the Firebird Forums, trying to get as much info as possible)
Ever since I got my 89 Firebird about a year ago, it will just ... die... now and then, and I have no clue why. I've replaced the fuel filter, air filter, O2 sensor, cap/rotor/plugs, ran all kinds of different injector cleaner in it, checked computer codes (gives an "everythings okay" reading), uh... what else... heh, I've done quite a bit to it short of taking it in and having the actual injectors looked at. Also, if its sittin in park or neutral (yep, automatic, with the weak 2.8l 6 cyl) and I tap the gas, to get it revvin' at about 2500 rpm or so, and let off the gas, it will climb back down VERY slowly, barely moving/slowing down, until I hit the brake, and this is in park! Some sort of vaccuum leak or something, I dunno, you guys have ANY ideas?