For getting AFM checked you can go to many garage who have Jeep computer and they will do computer check in 30 minutes for 200 dhs. Robbies, icon auto, Max garage many are there in Al quoz area.
Get this squared off first and also look into the possibility of CKPS (Crank Position Sensor) most misbehaving sensor when goes bad: rough idling, more fuel consumption etc, cost only 200-300 dhs to change but worth guessing and changing when dealing with these dodgy issues.