main engine fuse on a 1991 ford f150?

Main engine fuse?

There is not a main engine fuse.

Have you checked to see if the coil is putting out spark or just the spark plugs?

First thing to do is get a test light and find out if there is any juice going to the ignition. If there is then the problem is in thee ignition.

If not then there is a black plastic box under the hood on the inner fender that holds all of the big fuses (Ignition, headlights, ect.) . This is where the fuse would be for the ignition.
 
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