The problem you are experiencing sounds similar to this:
http://www.wk2jeeps.com/tsb/tsb_wk2_0900615a.pdf
I'd be asking Jeep to check their records to see if this TSB has been done on your vehicle.
This may also be worth trying:
https://www.liqui-moly.com.au/produc...intake-decarb/
Cheers