It sounds like your ignition switch will need replaced. The one that is inside your steering column.
dependes on the car
eBay
Under drivers side of dashboard
no idea
Mounted on top and inside the fuel tank.
Check the owners manual
yes it will fit 1991-1994 models.
sticker underneath the hood
more than likely if your state requires emissions testing.
Yes if it is a 4.0.
i think you will find this relates to the engine coolant sensor out of range
2.5l 4cyl is 22ft lbs not sure what engine you got