when I go up a grade, my gauges and dash sensors go crazy. Why?
I have a 2001 lexus ls 430. Whenever I go up a grade my rpm gauge goes up and down and all my sensors on the dash light up. When I pull over and turn off the car for a few minutes. It's fine. I took the car in twice to the lexus dealer. They replaced the chip twice and still can't find the problem. It worries me when I have to drive on my long distance trips up a grade. It only happens whenever I go up one.