Help diagnosing rough idle

[jaywebguy]

Not sure where to start on this one. Jeep starts up fine, goes down the road fine, but idles a little low and a bit rough. Occasionally it will die on me at a stop. This seems to happen (rarely) after it's been under a heavier than normal load. Did it yesterday pulling a small utility trailer (lots of hills). No codes are being thrown. Recently we had had work done, replace the cats, o2 sensors and a general tune up. This issue started after all that.....

 

[Chris]

A rough idle is almost always a dirty IAC or throttle body. See this thread for how to solve that:

How to clean your IAC (Idle Air Controller) valve

 

[Jerry Bransford]

In addition to Chris's advice, there are a few more possibilities. First, your Profile was not completed so I have to ask you, what model year TJ do you own and does it have the 2.5L or 4.0 engine? Next, exactly what brand and model # spark plugs did you install? Depending on your model year, some spark plug guides are incorrect on what spark plugs are compatible with 2000 and newer 4.0L engines.

And what brand of O2 sensors did you install? Bosch? NTK? Store brand?

P.S. Please complete your Profile.

 

[jaywebguy]

Updated.... Didn't realize I hadn't added the details. I'll add the rest of the info you requested later today. Thanks

In addition to Chris's advice, there are a few more possibilities. First, your Profile was not completed so I have to ask you, what model year TJ do you own and does it have the 2.5L or 4.0 engine? Next, exactly what brand and model # spark plugs did you install? Depending on your model year, some spark plug guides are incorrect on what spark plugs are compatible with 2000 and newer 4.0L engines.

And what brand of O2 sensors did you install? Bosch? NTK? Store brand?

P.S. Please complete your Profile.