This is by far the strangest thing to every happen to my car. I was driving on the expressway, about 70 mph. I decided to pass a car so i floored it in fifth gear, not insane acceleration or anything, but i caught something on the cluster out of the corner of my eye. In the half a second that i floored the gas, my spedometer climbed all the way to 150!!!
After more investigation, i found that the speedo does this everytime i floor the gas in high gear. Also, i had the cruise control on at 75 mph, and it kept bouncing between 75 and 85.
I searched, but found only links to slight problems with the needle bobbing a bit back and forth. What is going on?