Truck won't stay running in gear

[BrownChevyTruck]

Chevy 1988 truck 5.0
My truck will start and run, but once it is warmed up and you put it in drive or reverse it dies, it will not stay running. If you put it in neutral or park it idles fine. If you put it in drive and stomp the gas it will drive, but when you come to a stop sign it will die, unless you put it in neutral.
We have replaced: rebuilt throttle body with injectors (2), air control value replaced, MAP sensor, TPS sensor.

Any suggestions?

[Answerdude]

If it only dies in reverse, then you may have a wiring problem. The engine torques in different directions depending on drive or reverse.
There is a ground on the back of the passenger side cylinder head in the truck that may be corroded, broken or loose.

[Gary]

Ya. I have seen that ground wire problem a lot of times. It is a black wire that goes right behind the intake, up against the firewall. It is bolted straight down on the top of the engine, almost on the transmission bell housing. Give that a little tug to see if it breaks off.