Engine Exhaust System problems of the 2006 Ford Freestyle

I drive a 2006 Ford Freestyle. I would like to report that when the car has been running and it is a hot day when placed in reverse it will accelerate on it's own and then the motor will die causing the check engine light to come one. Typically if I turn it off and wait a few minutes it will come back on light free, but there has been two occasions when it has not. The first I took it for a diagnostics where I was told to take it to Ford that it seemed to be a transmission issue, Ford told me that they were not sure but they cleared out the sensor to give it a good wash if it happened again. It has happened again only this time the engine dying to acceleration ration has increased and a good car wash has not helped the issue. I am becoming very concerned before the acceleration was only in reverse now it is occurring in drive as well and happening more frequently. I have plans to take it to my local Ford dealership however I do not have high hopes for answers as they were not all that helpful the first time.

My 2006 Ford Freestyle will "lunge" into gear in really hot weather. My check engine light came on so I went to autozone. The tech told me it has to do with the throttle body. My car has approx 85,000 miles on it.

After sitting in park for 20 minutes, my 2006 Ford Freestyle was put into reverse to back out of a driveway and quickly accelerated while my foot was on the brake. After putting the car back in park, the wrench and indicator lights came on the dashboard. I placed the car back into reverse when the vehicle proceeded to accelerate again with my foot on the brake. After backing out of the driveway, the vehicle was put into drive where it proceeded to accelerate without my foot on the accelerator. The vehicle has since been taken to a Ford dealer to be repaired. The dealer states that it is a problem with the exhaust gas recirculation which they are not covering since the vehicle's warranty has expired.