89 Chevy G20 shuts off when coming to stop

Maintenance/Repairs
1

Like the title says, 89 Chevy G20 V8 5.7l. When coming to a stop or in idle while in drive the van will shut off. Here are the symptoms.

  1. When driving below 10MPH the oil pressure gauge will drop to 0 and then the van shuts off.
  2. When starting the van a nice white plume of smoke comes out of the exhaust.
  3. Van had been chugging a bit when stopped and the AC was on.

I replaced the fuel pressure regulator today thinking that possibly the engine was getting flooded when slowing down, but that did not fix the problem.

Thoughts?

2

grey white or blue smoke? ; losing oil or antifreeze?

3

Grey white. I am pretty sure that is from oil. Don’t know if that is related to the bigger problem of the van shutting off.

4

Try unplugging the torque converter lockup solenoid if it has one…it should if it is an auto…

5

Hmmm…possibly. I am also going to look at all the vacum lines and see if any are broken.

6

“When driving below 10MPH the oil pressure gauge will drop to 0 and then the van shuts off.”

What happens first? How many miles on it? TBI or multiport?

7

The oil pressure needle drops first. 89k miles…Yeah, I know! TBI

8

Looking at some other forums and it looks like it is most likely a problem with the vacuum