Hello

I have a problem with my 2001 TJ magna. I just had my 100k service by mechanics (i've always used and all my friends use.) After the car is started and sitting in park or neutral it feels fine but when i put it into drive or reverse missing a beat and the ride is very rough(Misfiring) I took it around the block to check if it was just at idle, i can only feel it when i am at approx under 20kms or sitting still. (I havnt driven it since i took it around the block a week ago) until i turned it around for the mechanics today and it was still doing it. The mechanics rechecked the spark plugs and leads. They told me they took the distributor out and got it checked somewhere but it was all fine (They had a problem with a magna and it a while ago) They're coming back tomorrow morning and was wondering if anyone would be able to help figure out whats wrong.

Robert