I've been having problems with starting, where if I don't hear the humming
(after turning the key) before cranking, it will not start. But once in
awhile when this humming sound comes on, it will invariably start. Its no
telling when will it "starting humming" before cranking. On this one
occasion when it did start, I drove around the neighborhood and after about
2 miles, it died, while in motion. After repeated attempts, it would not
even attempt to crank. I let it "cool off" for 30 min.and then turned the
key, no hum but I continued to crank and after 45-60 sec. it started! I've
just replaced the ignition switch. No help. In the past I've changed the
relay to fuel pump, replaced a new fuel pump, new cables & spark plugs, new
distributor cap with rotor, new battery.

Any help is greatly appreciated?

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With warm regards
khgo50