There's a chance that this has a cable from throttle body to trans that is stuck/broken in a position that is telling trans to stay in lowest gear like it was hauling a Winnebago uphill. Take a look and see if that might be it. Just a shot before it goes in,
T
Tom Greenleaf - MetroWest Boston - USA
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http://www.autoacsystems.com/tomgreenleaf/