First Thank you for allowing me to loin so I can get some help with my wifes Suburban. It has been frustrating and I'm hoping you guys can help me out.

I am experiencing low idle stalling when my wife is in car pool picking up my kids which is causing her to worry which is taking a toll on me lol.

So some background after first experience. Only shows check engine after stall, after starting back up CE light goes away not storing a code.

1. Took vehicle to dealer, they replace the body control module they saw a stabilitrak code somewhere, stalled the next day in carpool. While it was there they mentioned Best Buy did a crappy job wiring up our aftermarket stereo we had installed a couple years ago.
2. Took it to the local car audio shop, had them straighten out the stereo wiring, install new LED headlights and new speakers. Followed my wife home and the brake lights were constantly on. I watched some youtube videos and saw that it could be a bad brake switch, replaced it with an AC Delco myself. Problem solved. Car stalled the next day at carpool.
3. Low oil alert and gauge at 0 for oil pressure. Took it to a shop had the oil sending unit replaced and the small filter that goes with it. Stalled the next day in carpool.
4.Did some online research thought maybe it was the throttle position sensor, replaced it myself and cleaned the throttle body. Engine rev went crazy up and down, took back to the dealer they programmed the new TPS it ran good. Died again! at car pool.
5. Took to another shop they ran it through some fuel tests, they said they replaced the 175 amp fuse, wired the new headlights to an AUX hvac fuse? to see. They let it run all day didn't fail they said they got it. Stalled on us leaving the parking lot.

So I have about $1500 or more in repairs and nothing has worked, tried a dealer and a smaller shop. I feel like its worth trying a new throttle body, I really would like to get thoughts on what you guys suggest at this point I'm throwing money and parts at it and nothing is working. I'm pretty mechanically inclined have worked on my own stuff my whole life but this one has me stumped. My wife is driving my new Dually High Country and my kids are destroying it, and I want to get them back in the suburban, the dropping it off somewhere and picking it up is a real inconvenience with 4 kids and I own a business.

Really appreciate anyone'* perspective on this and any help you can offer.

Thank You
Josh Penn

I haven't heard of a lot of this on this model year, however, maybe it'* the upper intake manifold gaskets?

Questions:

How many miles on the vehicle?

How many miles have you owned it?

How long have you owned it?

What region does it live in?

How far is school from home?

In carpool when it stalls, is it in gear or in Park?

Does it only stall in the afternoon carpool or does it stall other times that it is driven for a while then stops in gear?

How warmed up is it when it stalls?

How did you clean the throttle body?

155k miles

I have owned it since 50K miles

6 years I have owned it

North Carolina

School is 10 miles away

typically in drive with brake pedal held in or in park

stalls only when sitting still with engine warm

fully warmed up

We actually just had the throttle body and TPS sensor replaced by dealer, they fixed wiring they said to TPS harness, stalled the next day. Since no codes are coming up could it be fuel? I have heard the accelerator pedal assembly could be an option? Again with no codes it'* hard, also though of maybe a bad ECM?

Personally, I'm thinking about the intake manifold gaskets.

Does it stall other places where you do the same things . . . like at a drive through? . . . or is it only ever at the carpool?

Throw a crank sensor on it.