Lose Power Steering problems of the 2007 Dodge Durango

I bought this vehicle new in 2007. I have only had minor problems until this began. The vehicle idle began fluctuating while sitting still. It would rev to 2000 rpms and drop and nearly stall. It doesn't happen regularly, so I wasn't concerned. Then it stalled on my wife in the drive thru. I cleaned the throttle body and replaced all spark plugs and coil packs at around 60000. This had little or no effect. We continued to drive for a few months and then this problem began. My wife called and stated it lost power steering and throttle, but the engine was still running. She turned it off and restarted and everything was fine. I thought she had mistaken because the ac and some gauges will operate if the key is on but engine is off. Then it happened while I was driving. I was running 60 mph and it cut out. I lost all power steering and could hear the engine running, but had no power at the accelerator. I shifted to neutral and restarted and everything was fine. In that few seconds, I dropped to 35 mph. Had this been on the interstate, it could have been tragic. I checked online because I have no clue what would cause this other than a computer issue and found others have had the same issue. I will be calling my dealer to find a cause. My wife is afraid to drive the vehicle now with our four sons in the car until this is fixed. I completely understand her point. There is no way she will be able to muscle the car to the side of the road if this happens to her. It is only a matter of time until a family is rear ended on the interstate because the vehicle stalls. It's very confusing because the vehicle is running, but no power steering and no response from the accelerator. This vehicle will now be sitting in my garage until a remedy is found.