Erratic cylinder / fuel injector errors - bucking car under load and hot day.

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First time this happened I was driving a trailer from PA to TX. I just got into Texas, it was very hot, and the Jeep started bucking violently. Engine light went on. I found a Jeep dealership, they read the codes. I forget which cylinders and injectors came up. 1 guy told me is was serious, another guy was awesome, he said I could safely get home 7 more hours. I let the car cool down, it got me home. Since then my Jeep has been to 5 repair shops since August 2016 with multiple misfires (bucking), each time a code comes up it is a different set of cylinders/fuel injectors. What I can do to cause the car to buck. Hot day AC on while towing a trailer up a hill Mis/bucking starts at 60 mph. I can get it to stop by backing off gas. If the engine cools down it will also help. If the AC is off it helps too. Even the hot day and AC will not always create the problem. One shop did fuel cleaners, fuel kit, new plugs, new air cleaner, it improved mpg, but did not fix problem. The car has been in 2 shops for 2 weeks with them trying to replicate the problem. Anyone out there have similar problem? 4.7 160,000 Thanks for any help.