Engine will run just long enough for her to get onto the shoulder, after a few mins it will restart?

Hi Jacobandnickolas
i havent been present when the truck has this problem, I will have acess to a presure guage over the weekend and will take the truck out myself, havent checked the spark but I am planning on taking it to a muffler shop on Monday to get the exhaust pressure checked, I changed the fuel pump relay yesterday, and tapped on the cat converter with a rubber hammer, couldnt hear anything rattling around in there, havent drove it yet since changing the relay, I will let you know if theres any change
thanks for your help
Mike
sorry I forgot to say there are no overheating problems, but I still find it strange that it only does it during the hotest time of the day?

Hi Joe
the relay didnt cure the problem
the cat converter checked out ok,
i changed the throttle position sensor as i
noticed the engine speed would sometimes rise when the truck was idling.
The problem has not occured since, (the past 3 days)
so im hoping thats was it.
Thanks for all your help
and maybe this will help others with the same problem.
Mike

Hi Joe
the truck has been running good since my last post, but the weather was cooler 80-90 deg.
Yesterday it was 103 deg. The truck cut out, just like before. It refused to start, I brought it home on a wrecker, probably took 1 1/2 hours. Turned the key when it was unloded and it started right up
where do I go from here? The coil is right behind the radiator, can a coil act like this if its too hot?