same thing happened to my brothers 89 chevy silverado . . .it did that in the cold but would stop after a while of running. it only did it some of the time when it was really cold outside in the morning from sittin all night. check and see if the transmission fluid is dark(er) than it should be, and try changing it. when it got warmer out (later on in the season) it stopped doing it for some reason and we havent had trouble since
p.s. this was like a year ago^
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