1994 Honda Concerto

Transmission problem
1994 Honda Concerto 4 cyl Two Wheel Drive Automatic 135000 miles

I had the motor and transmission replaced in a 94 Honda Accord and now after you go 10-20 miles, the D4 Light begins to blink and the forward gears are gone. They will return after it has been parked for awhile. Is there some sort of a code that needs to be reset to make the current motor and transmission work properly together? What else could this be?
Michelle Clayton
February 1, 2009.

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