2003 Envoy Stalls

My 2003 Envoy stalls only when both of the following 2 conditions are present:

The speed is below 20mph (or idle).
The air conditioner (or heater) is on.During these times is also when I have noticed the rpms fluctuate unusually, and the speedometer registers higher than I am driving. (Example: The speedometer will register 40mph while I am in stopped at a redlight.)

I'm not sure if the stalling and speedometer issues are related.

We've got trips planned this Summer.
My wife wants a new car.
Help!

Welcome to AF, clean the throttle body for starters, check the grounds on the l/s of the block also. Do this and post back what happens.

Welcome to AF, clean the throttle body for starters, check the grounds on the l/s of the block also. Do this and post back what happens.

I'm sorry. I didn't mean to pretend that I was a mechanic. I am a mechanically inclined school teacher. I have fixed things on cars, appliances, computers, and other. (This is only because I am not afraid to tackle anything, and most things have some type of rhyme or reason or pattern. Figuring that out is the challenge.) Now that you may have a better idea of the level of ignorance you are dealing with, what is a throttle body? and what is the l/s of the block? Am I hopeless?

Hello,throttle body if you no where air filter is the big round tube coming off air filter goes to tb remove loosing the clamp.using carb cleaner a clean towel spray inside tb & wipe clean by opening throttle u can cleaner futher.
l/s is left side of engine block. look for a bolt thats securing ground wires remove clean retighten Good Luck!!!

Good info inafogg, I would suggest using application specific CRC throttle body cleaner rather than carb cleaner.

Thanks max,not to get off thread topic but whats the difference???MIKE,

TB cleaner will not leave a residue that can allow carbon to accumulate more easily, according to the MFG.