1991 F150 runs and dies

I’m working on a 1991 Ford F150 5.8 Engine code 212 (no Tachometer input to process spout) it starts runs then dies running time very . It will start back only if u turn the key to off .if u try it with out tuning the key off u have no spark

Follow this sheet

Thank u for working sheet I have measure all of this and all comes out good

Does fuel pump run When you turn key to run position? What is the fuel pressure reading? Odds are either the three capacitors on the pcm have leaked on com board or pump is bad but also check fuel pump relay to see if it works like it should. With the pcm it's located in the drivers side side panel by the foot well connector is located on engine side of firewall and behind wheelwell pull cover off and check the capacitors to see if they leaked. if so a pcm is in your future.

Check the pcm no signs of any thing wrong with it as far as looks .The fuel pump runs got 50 psi the truck will run for 30 seconds and some times it will run for 15 minutes think the longest it ran is about 25 minutes

Ok that's good news I would then ohm test primary and secondary parts of the ignition coil before and after it's ran and dies again. My hunch is coil or pip sensor drops out when it runs for a bit.

Ok it will be few days before I get to work on it again will update when I do