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89 Chevy G20 shuts off when coming to stop

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?

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

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.

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

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

“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?

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

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