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1989 GMC Sierra Engine idles but stall when put in gear whe

Tiny
GARYZGEB
  • MEMBER
  • 1989 GMC SIERRA
  • V8
  • 2WD
  • AUTOMATIC
  • 145,000 MILES
Hi. I''ve put in new spark plugs, wires & ignition coil and still have the identical problem. The truck starts & runs fine when cool. When it heats up after about 40 minutes of idling or 20 minutes of driving, it stall if I stop at a stop sign, or idles rough in neutral - then stalls when I put it in gear, unless I rev the RPMs up to about 2000 before shifting into gear. Once it gets really hot (not overheated !), If won't even start until it cools down. Any ideas. I've thought of the fuel pump, but as I understand it (unless I'm wrong), the pump is in the gas tank, so I don't see how it could be a heating issue?
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Tuesday, August 17th, 2010 AT 8:11 PM

1 Reply

Tiny
TOOOMANYTOYS
  • MECHANIC
  • 513 POSTS
There are two common problems when these types of symtoms occur. One yes it could be the fuel pump and yes it is in the tank. I would install a fuel pressure gauge on the vehicle (you can rent one at most auto parts stores) make sure it maintains a 10 to 20 psi. If it does check the distributor make sure the shaft housing is not worn and that the ignition moudle inside the distributor is not burnt. I had a similiar problem and swapped distributors with a known good one and the concern went away.
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Tuesday, August 17th, 2010 AT 8:21 PM

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