Stall at idle

Hi,

What you described sounds like a faulty idle air control motor (IAC). Does it stall if you turn on the AC? The IAC is what is responsible for maintaining engine idle speed. Even though that is my first suspect, there are other things as well which will be discussed in the first link below that I attached.

Take a look through these three links. The first discusses the most common causes of a stall at idle. The second explains how to service an IAC and the third shows in general how one is replaced.

https://www.2carpros.com/articles/stall-at-idle

https://www.2carpros.com/articles/idle-air-control-valve-service

https://www.2carpros.com/articles/how-to-replace-an-idle-speed-control-motor-iac

If you determine the IAC is bad, here are the directions specific to your vehicle for replacement. The attached pics correlate with the directions.

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2004 Jeep Truck Grand Cherokee 4WD L6-4.0L VIN S
Procedures
Vehicle Powertrain Management Fuel Delivery and Air Induction Idle Speed/Throttle Actuator - Electronic Service and Repair Procedures
PROCEDURES
REMOVAL
The IAC motor is located on the throttle body.

1 Remove air duct and air resonator box at throttle body.

TPS Electrical Connector - 4.0L Engine

pic 1

2 Disconnect electrical connector from IAC motor.

Mounting Bolts (Screws) - IAC

pic 2

3 Remove two mounting bolts (screws).
4 Remove IAC motor from throttle body

INSTALLATION
The IAC motor is located on the throttle body.
1 Install IAC motor to throttle body.
2 Install and tighten two mounting bolts (screws) to 7 N.m (60 in. lbs.) torque.
3 Install electrical connector.
4 Install air cleaner duct/air box to throttle body.

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Let me know what you find or if you have other questions.

Joe