88 GMC 5.7l cuts out / diesels

I have a 1988 GMC pickup with a 350 engine and TBI. The other day my wife said she was driving it and it just cuts out. After pulling it over, it seemed a little hard to start, but after a few cranks started right up. Other times it would act like it was going to stall, and would have poor power, then it would be ok again. I cleaned the TBI and drove it today and it also just cut out for me too. When it did, it also sounded like it was dieseling. I pulled it over and when cranking it over, it made the same dieseling noise, but then started up and ran fine.
Did a vacuum gauge tested and all tests seemed fine.

Any ideas?

Check fuel pump preasure.

Did a fuel pressure test today, is is getting about 15psi when it is running. I also took it out for a drive again and it did cut out. I tried disconnecting the EGR value, and I still hesitated a few times real bad.

What was the pressure when it died, this is the key.

I didn't leave the gage on when I drove it, but when it dies, sometimes it starts right back up. I thought that with a fuel pump they usually either work, or don't. I am going to have the ignition control module checked. It seems to only happen after the engine is hot. I had a Grand Prix that would just stop sometimes, and then start again when it got cold. That's what it turned out to be. I swapped out the coil with a spare I had, wasn't that.
I also thought about the EGR valve or EGR solenoid, though the EGR valve leaks down, it does react to a vacuum pump.

Any ideas are greatly appreciated!

Check the TBI to manifold gasket. Sounds like it may have a big vacumn leak with the dieseling thing.

Well I took the ignition control module up tp AutoZone and he said it was bad. I bought a new one for $30 and so far so good.

Thanks for all the help!