Truck keeps stalling

It will do it at idle or while driving.

Yes it does start easily, the operating temp is about 200 and the idle speed is 800-900 RPMs. The oil pump gauge reads a low reading then goes to a normal reading when I raise the idle. The check gauges light will come on usually before it stalls. There are no codes currently or stared codes currently on the truck.

The CEL does not come on because it is different that the check gauges light. The one that comes on is check gauges not service engine soon or check engine light. I just checked the fuel pressure and it is testing 45-50 psi on the high point and right around 40 psi constant. Would a low psi cause the fuel pump to over work itself or could there be a different problem. Replaced the fuel pump with an aftermarket one and had to switch out the connecter to the fuel pump. Could an incorrect wiring job cause a low fuel pressure?

I will do that, I will run it for a while until it stalls then inspect the ignition switch.

Was just out there running the truck while idling it would stall with the oil pressure gauge at 10 and the rpms at 850. Most of the time it would start right away, but once it took about 5 min before it would start again. I did not notice ti ignition switch to be really hot. Is there a way to test the ignition switch to see if it is the problem?

Could a bad starter solenoid cause it to stall as well? It does not want to turn over the battery voltage is at 12.50 and the voltage while cranking is 10.5.

The dash indicator light does come on. The ignition module was tested and tested good. I will be checking the coil pack and also have the alternator tested. Could the crank shaft sensor cause some of these problems as well? Could a faulty ground cause this problem too?

Is there a way to rule out the crank sensor or cam sensor? Like specs for the voltage reading.

Found out it was the starter solenoid, as it got hot it would not work anymore replaced and it worked like a champ again. Thanks.

With my 40+ years experience as an auto tech I thought this one was going get me. But I found it, a loose connector pin at fule pump plug. After stall and turn key to start you restart fule pump relay.

This is why I really questioned the starter. When I would go crank the truck to start it the starter would turn slow. I connected the battery in an attempt to jump start it, however it still had the same issue, it would crank slow. I finally got the truck to start and in about 10 minutes it would stall. At this point I would try to start the truck and it the starter would not engage anymore. At that point when the started stopped working like it should I replaced it. Put a new starter in and it started and ran at idle for at least 1 hour. It also drove about 50 miles and never stalled. The truck has been running fine since.