Hi:
It could be the speed sensor. I looked over our conversation and didn't ask if you have the computer scanned for trouble codes. Have you done that? I not, I recommend that you take it to a nationally recognized parts store and have them scan it. Most of these places will do it for free.
Let me know what you find. Also, when the speedo goes faster than the car is going, does the engine sound like it's racing?
Joe
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Friday, October 31st, 2008 AT 10:54 PM