My 97 jeep grand cherokee won't start it will crank but will not start. I was driving on a snowy road a was in 4 wheel drive all of a sudden it just shut down. No warning no hickups just shut down and will not even act like it wants to start. Does anyone have any ideas the plugs are new and gapped. Please help me out some how. I'm looking to sell it but I want it to be running first! It ran great without any problems at all until this happened