Idling Out Truck idles down and then out at stops, reverse, and when putting in drive. Have to minipulate brake and give gas so does not stall out. Had fuel filter replaced, new coil, but problem still persits?

SOURCE: 1992 chevy corsica runs rough,stall or dies after stopping

Sounds the EGR valve and EVP sen is bad even if you tested it. The EGR valve cntrols idle and if carbon up will make the car stall or idle high and low (rpms going up and down) This was common on all cars during that time. I would say replace the EGR valve and senosr. This should take care of the problem. One more thing have the fuel pressure check on the car.

SOURCE: my 2002 chevy silverado struggles when idling

I had the same truck and it had lean codes.
The intake gaskets go bad causing too much air to enter the chambers. ITs the same gasket for the 4.8 and 5.3 litre motors.

upon tear down i found the fuel pressure regulator had fuel in it indicating the diaphram went bad.

Fixed and everythings all right.

BUT check your codes first I don't want to you to do a tear down with out knowing what the computer is doing first. Auto zone does free diagnostics and tell you what the codes are. Let me know I can guide you from there.

SOURCE: truck idels fine but put into gear stalls

you need to adjust the engion timing

SOURCE: truck stalls when I give it gas

It sounds like they have got the distributor out of time. You will need to adjust the distributor. That is what it sounds like.

SOURCE: RPMs fluctuate, sometimes stalls at stops, wierd shifting

check throttlr sensor