I have a 2002 with exactly the same problem. I had it scanned for error code and came up with P1776 which seems to be an overdrive transmission problem, something to do with the valve body in the trans with a valve hanging up (not moving correctly).
Does your check engine light come on? If so go to Autozone and ask them to scan it for the trouble code. I'm betting that my problem is varnish on the valves which is making them stick. So I am using a cleaning additive to see if it helps. If you find out anything about what to do please let me know.
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Tuesday, January 17th, 2006 AT 10:36 AM