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?

When this happens take the air cleaner off and see if both injectors are working, may need a second person to crank the engine. If ok I would check fuel pressure, you will need an adapter with the fuel press. tester to do this. 10-13 psi. This can be an ignition issue also, but start with the fuel system.

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.

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!