There's a bunch of stuff that can go wrong, but I had a 95 mystique sitting for a year and a half, outdoors, and it started right up...after i replaced the battery (which was going bad when we stopped driving the car...and IIRC it was the original unit). car started right up. I recommended changing the oil to my parents, but it's their car and their problem so i don' tknow if they ever did.

1999 Silver Frost SVT #609 of 2760 Quaife, lightened SVT Flywheel, SPEC stage II clutch, removed resonator, k&n drop in - various other goodies too.