Running rough when cold

Hi,

Does the low idle happen only when it's cold? Also, have you checked for engine vacuum leaks? If not, start with that first. Take a look through this link. It explains how to locate and repair an engine vacuum leak.

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

Next, by chance do you have a live data scan tool? If you do, let me know what the short-term fuel trims are when it runs rough. Also, before starting the engine for the day, see if the engine coolant temperature sensor signal indicates a temperature very close to the ambient temperature.

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

Take care,

Joe