We have a 1990 G2500 van with a 5.7. It dies suddenly. Happens randomly at various speeds. More so when lower RPM'*. If I crank it a while it will start back up. I pulled a plug wire while it was turning over to restart it I saw spark( verified three times). I had no gas spraying in the TBFI. If I spray a little carb cleaner in the TBFI it will fire up and stay running. I drove around with the doghouse and air cleaner off and when it would die I saw No gas spraying, but as soon as I sprayed a little cleaner it would fire up (did this many times). What am I missing? It seems like both TBFI'* are turning off at the same time and then they turn back on when I spray the cleaner. I don't get it. Haaaalp!

Check fuel pressure.

I agree, check fuel pressure first. Let us know what reading you get from a fuel pressure gauge.

Also:

- How many miles on it?
- How many miles have you owned it?
- Have any repairs or maintenance been done on it recently?

About 130K. Is there a port to check FP?

It'* the simplest kind. Just a schrader valve on the fuel line on top.

Popped in a TBFI rebuild kit and VIOLA, no more issues! Thanks guys!

What led to the rebuild? Your process to the fix is needed.