2006 pontiac montana 3.9. will a bad tps cause low speed stalling? if I am on and off the gas peddle in slow speed conditions such as city driving, heavy slow traffic or long winding on ramps she has a tendency tp stall. was told to look for a idle control sensor but dont see one. thanks

I think this is fly by wire(TAC)......any codes?

It'* in the tranny shop for a rebuild. will scan it when i get it back. will a code come up for something like that?

Yes......what I mean by fly by wire is, there is no accelerator cable.......the throttle plate is moved by an electrical motor...

yes. I knew what you meant. Just trying to get some research done while I'm thinking about it. did I mention it has 342,000 on it?

With a TAC system, there is no IAC valve and no separate TPS......it'* all one throttle body unit.....

What you can try is this.....

With a rag, wet with carb cleaner, clean the throttle plate AND it mating bore.....then disconnect the battery(neg first), and hold/clamp together the two battery cables for a couple minutes(this resets all modules)....reattach the battery cables(pos first)......then make sure the tube going from the snorkel, in front of the throttle body, to the back valve cover, is intact.....

update! got the montana back on tuesday. my stalling problem must have been tranny related. it has not come close to stalling ounce. Iknow there are a lot of sensors on modern cars, one of them on the tranny must have been sending a bad signal or something. I cant believe how much better it runs. 750 rpm at idle. before I would take my foot off the throttle and it would dip below that and stall some times. crisis averted. till next time thanks tech.

750 is a about 100 RPM higher than normal for a gas engine.