If you don't have spark at the plugs, or at the distributor cap, the problem is probably a faulty ignition module. This is located under the distributor cap and ignition rotor. You need test equipment to check the coils, modules and pole pieces.
Why the defrost may not work in a 1993 Chevy Caprice Classic could be because the heating core is out.
could be either
Crack in intake or exhust, or belt glazing- Check all the intake and exhust bolts.
Blocked condensate drain hose on bottom of evaporator.
YES
No spark would usually be the ignition coil.
That usually means the engine is lean. Could be a vacuum leak.
An intermittent miss in a 94 Caprice could be something in the ignition system. Check the plug wires and ignition coil to start with.
You could look for Hypertech products, which are distributed by Autozone, Advance, and O'Reilly's.
If you get a Caprice with posi they aren't to bad in bad conditions, but they are still a car and not equipped with 4 wheel drive. Chevy Caprice's had decent ground clearance comppared to other cars though which could perhaps allow them to travel through muddier conditions.
A bad EGR valve can cause this smell. Or defective O2 sensor.
chances are the radiator. water pump possibly. anything to do with the thermostat housing. the housing itself or the regulator.