im switching out the motor in my 97 dakota im getting rid of the 3.9 and putting in a 99 5.9 r/t any know the problems i will run into? any suggestions on tuning it?

A good suggestion is to sell the Dak you have and just buy a dak with a 5.9 in it it'll end up being t cheaper and much less of a headache. You would need a new pcm, all new parts, a new wiring harness, and a different tranny not to mention the labor involved...