It maybe shot! No amount of cleaning will bring it back.
Are you getting a check engine light?
I could also be just that it's so cold out that it's having a hard time working properly.
Look for - vacum leaks, air intake system leaks or MAF dirty, Throttle body and linkage binding.
1996 2.5LT V6 Contour ATX
My Tour+help/info pics
E0 rims, Gutted Pre-Cats,CTA Custom Exhaust & Intake, Diablo Chip.