1999 Gmc Jimmy Vehicle Stalls Out Under Slowing Down Stopping Usually Starts

You may have a bad IAC ( idle air control) but try eliminating any vacuum leaks and cleaning the throttle body first. Remove the intake snorkel, have someone hold the throttle wide open for you and scrub the back side of the throttle plate and surrounding bore with an old tooth brush and some carb cleaner. Be sure to spray some into the small holes next to the throttle plate. That should help stabilize the idle. If it still has a problem, replace the IAC.

Do you have a check engine light? Might want to disconnect the TCC Solenoid and see what happens-could be sticking-start here

Sorry Wrench, didn't see you-I hope you had a wonderful Christmas and New year. I'm good talk later my friend

No problem Ras. Happy Holidays to you too.

BTW, I've learned that from you on the TCC solenoid at About -7 years ago-Thanks

That's not as big an issue on this later model stuff. You can't simply unplug a connector on these because most of the transmission is electronic control.

I get it, learn something new again-Thanks

How do you disconnect the TCC solenoid?

You can't

Oh, ok. Any other thoughts? We tried changing the IAC & it didn't help.

Did you scrub the throttle body as I instructed?

Yes, had already done that before the IAC. It was very nasty, but didn't improve the problem.

Any stored trouble codes?

Nothing other than ABS code.

Then someone is going to have to analyze the sensor data to determine what is going on with the engine. The data can be interpreted by someone that knows what to look for.

OK, thank you for your help.

You're welcome.

We did all of the above without any improvements. What seemed to finally do the trick was changing the distributor shaft. It's running good now.