Transmission on 1994 Chrysler LeBaron

When I go to stop the transmission downshifts & the car will jump forward.Had the computer reprogramed,but after a couple of days it starts to do it again.

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2 answers
I would go to a good trans shop and have them check out your trans AND your engine mounts.
lose batterry connection bad ground somewhere from alternator or battery trust me had this problem easy fix