Bad idle and transmission not shifting properly

RANDREW688

MEMBER
2014 DODGE DURANGO
3.7L
V6
4WD
AUTOMATIC
100,000 MILES

I have the car listed above that idles really low after warm. Car drops RPMs when coasting to a stop, almost like a jerking feeling, but not a downshift. Intermittent RPM drops between 30-40 MPH. I've checked/cleaned the throttle body and all sensors. Just had it serviced and all fluids and filters are good. Not really sure where to go from here.

1 Reply

KASEKENNY

MECHANIC
18,907 POSTS

Low idle could be a couple of things but we need to start with the basics.

First is we need to check for codes. The target idle is set by the PCM and when it is not doing that the PCM will normally set some codes.

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing

If there are no codes, then we need to find out two things. First is if there is a vacuum leak. Here is a guide that will help with this:

https://www.2carpros.com/articles/how-to-use-an-engine-vacuum-gauge

Next is we need to monitor the fuel pressure when the idle is low.

https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator

I would suggest we figure this out first because if the RPM is not correct then it will cause of issues such as shifting issues.

Let's run through all this and go from there.

Thanks