Hello,
I have been working on my son's 07 H3 with a 3.7L i5 and automatic transmission for a couple weeks now, with the goal of solving it's stalling issues. It idles fine, but whenever you shift it out of park, it dies within seconds. Based on research on the forum, I have performed the following repairs. Some of which were basic maintenance, and others were parts I just wanted to replace now instead of later, since it is for a 16 year old boy.

Actions Taken:
1. Cleaned the throttle body
2. Replaced the MAF
3. Replaced cam position sensors
4. Replaced VCC solenoid
5. Replaced valve cover, spark tube, throttle body, intake manifold gaskets
6. Replaced spark plugs
7. Replaced secondary air injection pump and solenoid
8. Replaced PCV hose on the bottom of the intake resonator
9. Replaced transmission filter - (no metal shavings found)
10. Replaced air filter
11. Oil change
12. Replaced starter
13. Replaced water pump, fan clutch, and thermostat
14. Replaced all injectors
15. Replaced coil packs.
16. Reset transmission adaptive pressure.
17. Replaced factory radio with non-onstar compatible replacement.

Current state:
No CEL and no codes.
Fuel trims are between 0 and 3 for both short and long while idling.
02 readings are within tolerance.
Fuel pump relay testing results in fuel pump relay triggering on demand, and pump running as expected.
All fuses and relays have been tested.
No corrosion on the fuse panel.
Engine idles at roughly 960 rpms on cold start, then drops to 650 rpms after warm-up.
Transmission shift solenoid tests perform properly.

Notable Observations:
Revving the motor to above 1000 rpm will allow it to shift intro drive and move forward. Upon coming to a complete stop, the engine immediately stalls.

Things I have not tested:
Fuel pressure - (need to purchase a new gauge)
Fuel pump voltage at idle

My thoughts on potential causes:
Throttle body
Fuel pump
Torque Converter

I appreciate any input, as I am new to the 3.7L platform.

 

maybe the torque converter lockup solenoid is engaded or stuck?

 

Scan tool shows it being functional and the state changing when using the service toggle.

 

May we assume you cleaned the Throttle Body off of the truck and used only TB Cleaner?

Using anything other than AC Delco sensors is likely to cause problems in the future on H3s.

This is the list for false stall/stall issues... and it appears you did almost all of it. Acts like it wants to stall/rough idle -No CEL -What To Do:

Good luck.

 

Throttle body was cleaned using CRC throttle body cleaner.
All sensor replacements have been AC Delco.

 

Check fuel pressure.

 

Fuel pressure at idle was 58psi.

Pressing the throttle, or shifting into gear causes a drop to 45psi.

Looks like I get to drop the tank.

 

Also wanted to add that I was doing some live scanning during the fuel pump testing and noticed the oil pressure switch was toggling from good to low almost every two seconds. So, it wasn't staying low long enough to trigger the dash light.
Upon inspection, the oil pressure switch was leaking a small amount of oil through the connector. Purchased a new AC Delco switch, and am reconditioning the connector to remove all of the oil and debris. I think its unlikely that this alone is causing my issue, but fixing known broken components has never been a negative impact to the functionality of an engine for me.

 

Look here> FPM

 

Finally got the new fuel pump and oil sensor in. Idling has improved quite a bit, but still experiencing the stalling when shifting out of park.