NHTSA Complaint #11440318 — 2013 FORD MUSTANG

Randomly while driving there is the engine revs up but car does not go any faster, no reponse from the throttle, no pwower. It slams down into lower gear, at one time the rear wheels screeched. My wife was driving this time, we were in traffic and was almost rear ended. She will no longer drive the car. Sometimes the wrench light would come on when it was slamming into a different gear then go away after shutting the engine off. I had someone check for codes but none were found. On 1 occasion I took a video on my phone while driving at asready throttle and the speedometer was all over the place, up at 40 down to 20 up then down to 0. I had the spark plugs, pcv, evap purge valve, throttle body replaced and it is not fixed. the car has 49K miles. We have owned this car since new. It happens more often now but I cannot replicate it on demand.