Problem starting, also idling?

1992 PONTIAC FIREBIRD
130,000 MILES • 3.1L • V6 • 2WD • AUTOMATIC
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LUKE2004
  • MEMBER
  • 9 POSTS
When I go to start it, it will just crank but I can spray some starting fluid and it will start right up and run just fine. Once started I can let the car sit there and run for 30 minutes and no issues. I’ve replaced the fuel tank, fuel pump, fuel filter, and fuel pressure regulator. I also replaced the idle air control sensor.
Once the car is running and I try and drive it, it will do just fine until I come to a stop while still being in gear the car will start to sputter and shut off. The car has plenty of power and doesn’t seem to lose power when I’m driving it.
Just trying to get an idea of what my problem might be or where I can start looking next? Thank you
Sep 17, 2023 at 8:02 AM
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STRAILER
  • Experienced Mechanic
  • 55,238 POSTS
This sounds like you have a vacuum leak, or the throttle body needs to be serviced. here are three guides to help us fix the problem with instructions in the images below for your car:

https://www.2carpros.com/articles/throttle-actuator-service

Use this guide when the engine is cold only:

https://www.2carpros.com/articles/how-to-use-an-engine-vacuum-gauge

and

https://www.2carpros.com/articles/stall-at-idle

I would service the IAC ports and replace the IAC motor. Check out the images (below). Please let us know what happens.
Sep 18, 2023 at 7:01 AM
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