Stumped HELP

95 cherokee sport, ran fine last night, has been overheating. go to start the car this morning, cranks but wouln't start. installed new plugs, cables, ignition coil, cap and rotor, still will not start. i know a fair amount about cars and working on them. i'm stumped, please help

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Mine does thiis after i park it for 2 or 3 days...Takes about 20 min to get her to fire up..I found if i try to start her up and turn the key off while it is cranking, then crank it again real fast it starts.. Some times i grind the starter doing this.....I need to fix mine soon, just to dam hot here