get the code pulled at autozone for the cel and that will tell you what it is

but at 80k I would at least change the plugs, fuel filter, air cleaner, all that basic stuff and that might help depending on what the code is

- 95 Mystique LS - Zetec/5spd - 99 Contour SeVT Sport - Duratec/5spd Official NE-CEG Contour/Mustang Family