Originally Posted by ramman97
what is the dsp 91 tune and how do i do it
That is more or less explained in the post above. For more information, check out the web sites for Diablo Sport, Superchips and Bully Dog. Each of those sites has a lot of information on engine tuners.
Since you have a 97, I am not aware of any tuner for Dodge gas engines prior to 1998. I am NOT saying there isn't anything, just that I am not aware of any.