hellah fresh

I have a 97 Nissan Pathfinder and have a problem with it dying after the engine warms up hot. When its cold i can start it right up and let it run for an hour or two but after it has warmed up for that long it shuts off. When i try to start it again it would just crank so i let it sit for about 10-20mins then it will start and run for another 5 minute and die. I had the car scanned and it showed up being a bad knock sensor.. so i replaced that and still doing the same thing. Now i went to scan it it shows: P0000 - systems checks Ok, 0 - Key cycles since failure. So now i ordered a crank sensor but i don't know that good that will do but does anyone have a clue what is wrong with my car? And what is: 0 - Key cycles since failure?

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1996 Mitsubishi Eclipse RS -Red ****UPDATE**** My car is no more! R.I.P. 12/12/05

Mods: 420a DOHC equipped with: bored 54mm throttle, 2.5" cold air intake, 2.5 chrome headers, 2.5 Down Pipe, 2.5 resinator, 5" 2.5 flared muffler, 2.5 custom piping, Megan front & rear strut, Megan rear lower tie rod, Monroe Shocks, Aerospeed coilovers

Rollers: 18" TSW Throphy / Pirelli P7000 225/40/18