Hey I have a 2011 xj 5.0 with a p0660 code that didn’t set the check engine light , the car pulls kinda rough at time in the lower RPMs and it idles funny at times . Mpg is normal , doesn’t stall or anything just and odd code I can’t seem to find a relating part for

 

A quick check with professor google.
https://www.obd-codes.com/p0660

 

Is the engine stalling? Sounds like it with the idle/vibration. Could be a dirty throttle body