Engine Belts And Pulleys problems of the 2016 Chevrolet Tahoe

While driving in the summer, my wife informed me that the vehicle had stalled and almost died--shortly after, the ac was not working. I left work and came to her--found that the compressor belt had shredded off. Took the vehicle to dealer and they replaced compressor. A month later, my wife was driving home on the interstate and the vehicle started stalling and jerking. The check engine light started blinking and traction control light also illuminated. I trailered the vehicle to our home a few miles away. I did notice the long bolt holding the new compressor was loose (1/4" space between bolt head and washer). The bolt was tightened, but did not appear to be a contributing factor. When idling, the engine jerks so hard that the entire car shakes-the engine nearly dies. . For some time, the vehicle has produced an unusual purring/clicking noise while navigating thru a parking lot or something at slow speeds--sounds like in the transmission or torque converter? the vehicle is being towed to the dealership now for their diagnosis.