I've had the quad xzt 65 horse tow module on for about 8,000 miles or so and this is the first time I've had any problems. The truck was idling for about 10 min. The rpm's started swinging all over the place and the truck was running extremely rough. after shutting it off and re-starting the idle was still very erratic. Driving it the power was good but when I let off accelerator you could feel the truck struggling to run. It was also putting out allot of black smoke. Pulled over,shut the truck off ,disconnected the xzt and the truck idled and ran fine. Still have check engine light on from prior described event though. Anybody else experience these symptoms in conjunction with this code. Truck only has 30,000 miles