Weird probs with Firebird

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?

Mass air flow unit maybe....same thing happened in my 88 camaro

Try disconnecting the MAF and running in Speed Density mode.
If it goes away, then you know it's the MAF Sensor.
One of the lil wires could have been damaged.

yes it could be your maf but it should throw a code if not there has to be something else wrong i would have the comp ship looked at regulating the aif to fuel mixture but u could just have some water in the tank to :banghead: