02 ACURA MDX TRANSMISSION FLUTTER

DURING SO CALLED LOW IDLE AT ABOUT 30 MPH, THE TRANSMISSION FLUTTERS. SEEMS LIKE IT'S EITHER GOING INTO 4TH OR 5TH GEAR AND LOCKING UP. WHAT CAUSES THIS? I
CANNOT FIND ANY TSB'S FOR THIS. ANY INPUT WOULD BE GREAT.
THANKS.
--
legzzalot

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