Why stop running goin down the road - 1997 GMC Sierra

Get the tranny diagnosed.
Chances are the tranny is about to fail.

If it is a sensor you should have a check engine light on and trouble codes stored in the computer.

Check this link first and cross your fingers.Here's a link to your fuel pump relay.

'm sorry but I believe you have this posted in the wrong product category? Please re-post the question in the proper category if this is the case, otherwise you have my apologies. This is the car and truck problem category

Please check the water level when the car is cold befor sending it away

check that sockets of head lights are good connected, fix it .

Turn on the key and listen by the fuel tank for the fuel pump to hum. A common problem is low fuel pressure. It will build pressure when the key is turned, use that fuel, and then the pressure drops. Kind of like when you're using a squirt gun that's getting empty.

check the fuel lines from the tank to the high pressure pump ,could be drawing in air ,but where??

Could be electrical. These are a bit hard to determine - especially since it it intermittent. Try to notice if the dash lights (ignition circuit) goes out when this happens. This will tell you whether or not you are losing the ignition circuit.

An engine needs 3 things to run: Fuel, compression, ignition.

Maybe the timing belt went out. Take off the dist cap and see if the rotor turns as you crank the engine.

Next run a compression test on all the cylinders.