1988 chevy truck 5.7 starts and runs a while then dies and sometimes will start up and sometimes it wont stgart right back up

Since you already changed all the trouble areas for spark try checking the fuel. When it acts up check the injector spray pattern, it should be a crisp cone. With the TBI injection system you will have an in tank pump with suction screen. The fuel then hits the filter under the drivers side of the cab in the frame rail. From there it hit's the fuel regulator in the throttle body. What doesn't get injected by-passes through the smaller line back to the tank. Since it is an older truck I would start with the filter (make sure you get and use line wrenches so you don't round the tube nuts off). Quick and dirty pump test is to use a large clear hose on the line from the tank to a clean pail and hit the key. If the pump is good and the filter is clean check the regulator. It comes apart easy just remember how it goes back together, any issues should be apparent.

If you check the fuel pressure with a gauge, it should be 9 to 13lbs. And I agree with yetilikesbeer. If it comes down to the regulator they do make a rebuild kit for it. The spring in there goes weak.

I have a 89 Chevy stepside 350, it's starts and runs about 10 minutes,then dies and won't start again until it sets a while.ive changed fuel pump,fuel filter and ignition module still nothing.butbwhen it starts it runs like a champ.plese help

Temp sensor

same problem here my fuel presure gage stills reads 0 on fuel tester gage.. After it dies seems to lose spark. Changed icm, distributor , fuel pump is new AC Delco changed crank sensor. My hand held computer said maf sensor changed that an no difference. Changed pcm an ecm no change in running. Runs Smith when its running .. I noticed i don't have the pressure build up in talk when you spin gas cap off no hiss like it used to. Any suggestions?

I have a 1990 Chevy V8 truck it will run for about 10 minutes shut off and not crank back until the next day

I have a 90 model Chevy Silverado V8 it will run for 10 minutes shut off not start back intill the next day

If this shuts off while slowing down to a stop or when you put it in gear after getting hot then I would check the Torque Converter Clutch Solenoid in the transmission. If it sticks as they do as they age, it will act like a manual transmission if you don't push in the clutch and stall the engine. Pull the connector at the transmission if it is the 4 pin connector and should fix your problem if you wait and do it when it is cold. Have run many of my 80's GM's like this for years. You just lose the 200 RPM's in overdrive. Hope this helps.

GURU2CT16- I hope you see this. My Truck runs fine normally. I used to have problem where truck would not start and wait and hour it would and run fine. Now it is dying while driving. Wait an hour and it start. After it dies it just cranks but won’t fully turn. I changed plugs. When I check the light it also says MAP sensor. I know that not it. You said yours says same thing so I’m hoping you figured it out and see this and can tell me what fixed it for you. If you don’t see this, I’m about to go down a big part replace rabbit hole. I not mechanic. I have heard people tell me ignition module problem, fuel problem. Distributor. A bad ground. I guess I replace everything till it fixed