My daughter has an 89 4.3 V6 and It keeps dying after it is warmed up.
I just did a complete tune up for her. Same thing

It starts great runs great, drive it about 5 miles or so and she dies.
Wont restart until you let it sit for 10 minutes or so them she will go another5 to ten miles.

Any help here ???

 

ok i'm just a driveway mechanic but is it overheating?? fuel pump related?? if its not that i have no idea.