Rough idle, and rough in the 50 - 65 mph

thats a lean code have fuel pressure tested

your idle air control valve is going out located behind the throttle body.

change fuel filter and clean fuel injectors.pour a can seafoam to 3/4 to full tank of gas see if it help the problem.

have you checked the IAC, idle air control,or cleaned the throttle body and plate.

If you haven't changed the plugs or had the fuel system cleaned, now would be a good time to do it. The number 1 culprit for rough idles is dirty injectors or plugs. You can try an injector cleaner in a can (or bottle) for under $10 and see if it helps, and then work from there. If there isn't any improvement then if you are able to, check the plugs for any gunky buildup and if you find a bad plug, make sure you replace them all (or have them replaced) at the same time.

Check, clean EGR valve & see if that helps.

the roughness at idle is the shocks .replace the shocks. i had the same problem

I have replaced the fuel rail on a couple of these for misfire codes that kept resurfacing it seemed to cure them.

My 2000 Grand Cherokee had the same problem, without all the sputtering, it would just die approaching a stop. We could only keep it running by slightly pushing down on the gas petal when coming to a stop. I replaced the Throttle Position Sensor, but that didn't change anything. A new mechanic I found replaced the Idle Air Control Valve, and we've had no problems in a week.