Hello, I have a 07 tl s auto trans that I just bought a month ago. Sometimes when going up a fairly steep hill at about70 to 80 mph, while in 5th gear I will hit the gas to maintain my speed going up hill and the car will seem to be accelerating on and off and if I hold my foot on the gas sometimes the check engine light will flash quickly. I also saw it drop into 4th gear very quickly and then shifted back into 5th ( in manual mode at about 75 mph) sometimes the gear indicator will blink randomly as well.


Otherwise it drives like a dream, shifts fine, doesn't seem to have any other issues other than this.