While driving at a very slow speed the car tracking system light comes on and the car lost the ability to accelerate. i was in the medium of a very busy highway and almost had an accident because the more i push on the accelerator the car would not go any faster. this is very dangerous and i am almost afraid to drive my vehicle. i have taken it to the shop for this problem and they had no idea why this was happening. i have to be very careful when at a stop sign getting ready to take off because i don't know if the car will accelerate or not. this has been happening for a long time and i am wondering if anyone else is having this problem.