02 Chev Express V6 Vortec Keeps Quiting Out of the Blue

Hi Their
My 02 Chev Exprss, V6 Vortec keeps having the same issues over and over. The Computer never shows any fail codes on the scanner. No one
at the Dealer seems to know exactly whats the cause. It dosn't matter if its cold, warm, raining, snowing does the same things over and over and never the same thing twice. This is a breakdown of what has happened so far. i drive Courie in this Van over 500 kms / day 1) Went to leave from work, started tha van, moved 4 feet then stalled. Wouldn't re-start. After sitting an hour, started and ran perfect for 4 days 2)on the 5th day, Drove about 150 Kms, stopped at a store, left vehical idling, when I came out it wasn't running (Stalled). tryed to re-start and it wouldn't. 10 Minutes latter, started and drove 2 Kms, died again wouldn't start. Came back 5 hours latter, drove home no problems. 3)Worked well for a week. Other then when driving at around 100kms / Hr, or under a load up hill, it felt like it was missing or cutting out, but, never died. 4)After a week, went to start in morning, wouldn't start. It took 2 hours before it finally started. Ran well, Stalled 2 more times, but always strated right up. 5)2 days after that, drove nearly 350 Kms, all day, never shut the vehical off. On the way back home, driving at 110 Km/ Hr, suddleny, stalled out of the blue. Coasted off the road, waited a minute, it restarted. Drove about 3 more kms, died again. this time it wouldn,t re-start. It tryed, ran abit, stumbled as you pumped the gas pedel, but wouldn't stay going. Came back 2 hours latter, drove it home worked fine. Stalled once, but re-started right away.
No one at the delaers can make it die for them. I replaced Distributor Cap, Rotor Button, Coil, Fuel Pump, temp Sensor, still does the same things. As you can see, It has no set patteren. Just does it at random. This engine was put in about a Month ago. Never had these issues with the old engine. Maybe I should simply put it out of its missery.Anyone who has any ideas, please let me know.
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If it doesn't set a code, then it will probably be in the ignition system. The most likely part would be the crank sensor, located in the lower front cover. Second choice is the cam sensor located near the distributor. Because the engine was replaced, it could have a broken wire at a connector on the engine. With it running, wiggle each connector to see if it will quit. These are all guesses. The best thing would be if you could borrow a scanner, so when it quit you could take a "snapshot". Good luck!
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