I have a 1988 chevy silverado 2500 5.7 wat wiill couse the motor to die wile in reverse and sumtimes when im at a stop light in gear idleing it will die to it has all new plugs wires n sensors

Right here 1988 90 Chevrolet Pickup Alarm Remote Starter Keyless Entry Wiring

Is the check engine light on ? Have you checked the idle air control valve ?

700R4

Ign module might help.

youll have to remove the motor mount bolts and jack up the engine a few inches.

A wiring problem.

Check for proper ground to fuel pump. did you replace the fuel filter? idle air control valve may be sticking or you have a vacuum leak.

check fuel pressure

Could be. But more then likely it's the gas. The gas you get these days from the pumps will gunk up after around 30-40 days. I'ld change the fuel filter see if that works. If not you might have to take the tank out to clean off the pickup sock. It's a small filter type on the end of the fuel pump. Of course, you should do a pressure test to see first.

This is going to sound crazy but i had the same problem with my 2003 silverado, changed the plugs, battery, and alternator with no sucess at all. Finally took my truck to a well respected auto repair shop locally in my area and they suggested i change the fuel filter under the truck. Crazy right? Why not, so i did and my truck ran perfect after i changed it. Shop tech said my truck was starving for fuel which in turn was not letting the alternator spin above the correct RPMs at all times which in turn caused the electrical computer system to not operate correctly. If you tried everything might as well try the fuel filter before you have to spend big bucks at the repair shop. Hope this helps.