Car Will Not Accelerate problems of the 2008 Dodge Caliber

The contact owns a 2008 Dodge Caliber. The contact stated while driving at 10 mph, the vehicle stalled. The contact stated that the accelerator pedal was depressed to the floorboard but the vehicle failed to accelerate over 10 mph. An independent mechanic diagnosed the vehicle and stated that the transmission needed to be replaced. The manufacturer was not notified of the failure. The approximate failure mileage was 152,000.

Car was already warmed and driven for about 5 miles, after stopping at a gas station to refuel and re-starting, it was idling very inconsistently and running rough, shaking. There was a dash indicator for electronic throttle control flashing. I tried driving it and there was jerking and pulling and the transmission wouldn't shift past 2nd, car would not accelerate beyond 12-15 mph. I made it home (about 2 miles) and left the car for about 6 hours. Upon restarting and warming, the car drove fine. About 1 1/2 weeks later, the same dash light came on, steady not flashing, car rumbled, then light went off and the car was fine. This happened on and off for about 2 weeks. Then, when ready to leave from work one day, I started the car to warm it and the indicator light came on and stayed on, the car was running very rough, idle was fluctuating between about 500-1500 rpms and shaking. I left the car, assuming when I came back the next day it would start and be fine just like the 2 times before, but that was not the case. I drove the car to a nearby mechanic, maxing out at about 15 mph, strangely the car seemed to pick up speed when I eased off the accelerator, and steady loss of speed while going up hill. The mechanic could not fix or even diagnose the problem, said it has to go to the dealer. It seems to be something to do with the throttle control. I will update it once I hear from the dealer later today.