99 durango 5.9 converter problem

whats the fix for a converter in a 99 Durango that at 45-50 locks up and then unlocks back and forth alot. it just started. speed up and it quits.

Again it just started. its not overdrive it only changes about 200 rpm.

Replace your TPS ( throttle position sensor )
Maybe $50 - $60 at the dealer, your converter problem will be solved...