Ok, so I thought that my problem had gone away...it hadn't really been acting up for awhile. But low and behold, it happened again on the way to work today.
I go out and start my Lumina, and she starts fine. Idles in park for about 5 minutes, and then I go to shift it into reverse so that I can get out of the driveway. Well, as soon as shes in reverse, the RPM's drop like no other, and the car ALMOST dies...like the engine bay was completely quiet, and she somehow managed to revive herself. The same goes for when I'm shifting into drive. So basically, when i go from either park or neutral, to anything else.
Here's what I've done recently:
New spark plugs
New IAC valve
New fuel filter
New Crankshaft Sensor
New Oxygen Sensor
New MAP Sensor
I think that pretty much covers it. Any ideas?
She's a 1990 3.1 MPFI Lumina