99 durango slt 5.2L 4x4. I'll be driving about 50-55 the truck will randomly jerk sometimes. It seems like a quick single misfire. Yesterday there was a code for 2 and 7 cyl misfire. Now the engine light is off but it still does it. With od on or off it still jerks accelerating and steady speed it does it allways between 50-55. I don't think it's the tranny because the rpm doesn't jump on the dash. Any thoughts?