On the LIM/UIM rebuild what benefits will I get? Lost performance over the years? Better fuel ecomony than I'm getting now. Someone help me out and tell me what it will do!!

I have a 1998 Contour SE, with 72K and it has the Duratech.

Thanks in advance!

Jason 00 Audi S4, 2.7 Bi-turbo quattro 01 S10 Xtreme, 4.3l 98' Contour SE with some mods 96 Cavalier (beater)