Welcome Joel. Finally we get a Plymouth on here! So, start out with the basics on the info -- 2-door,Turbo, Manual, Modifications? Also check out the DIY section of the Forum area to get some ideas. Since your car is older, the liklihood of getting it to perform how you want will be easier (OBD-I vs. OBD-II). Always remember, we're here to help, and if you have any questions, don't hesitate to ask.
It is a 1990 Plymoth Sundance 4dr 2.5L (non turbo) 3 or 4 speed auto. Have had it since last fall. Only has 122, 000 km's approx. on it. Have had to replace/fix: brake lines, couple of dents, soon some underbody work, water valve & swap parts due to rust. Have gotten 30mpg average with it. Would like to push it further. Kinda wish it was carberated, would give better milage. From Canada. The car seemed good, but after someone else looked at it, they found problems. Have basically paid for the car plus on fixes.