I would recommend starting by checking the trans fluid to make sure it is clean and full. If it looks dirty, you may want to try a service with a new filter. It's hard to know for sure what is causing it without checking it. Like you mentioned, it could be a shift solenoid going bad, but one solenoid shouldn't cause all the gears to do it.
Check the fluid and let me know what you find. Also, let me know if the check engine light has come on.
Joe
Let me know.
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Friday, December 17th, 2010 AT 3:20 AM