What would cause hard start, and engine dieing while acellerating?

They did do the testing/relearn on crank sensor,just saw it on the paper work, and they said the fuel pressure was ok. This whole mess started, during heavy rain, and my van wouldn't start. I finally got it started after a few tries, but the next day wouldn't start at all.Went to one mechanic, who replaced the coil, and distributor. Van ran horrible afterwards, stalling, loosing power, or just plain dying while driving ( not fun!) Took it to a different mechanic, they put in new plugs, wires, MAF, and they cleaned the throttle. Last Friday driving on the highway, slowly lost acelleration, and van died. waited half hour and it started up again, but still poor acelleration, and stalling. It was raining pretty heavy that day to. Brought it back to the mechanic, who said I needed a new serpentine belt. got that done. Said he came up with codes, PO3OOB, PO765A. Befor the no start situation my van ran perfect. Now I'm out over $1500 bucks, and a van that dosen't work at all.

I would need the van present with the proper testing equipment hooked up and do some test plus visual inspection before I could advise further .. There are just too many possibilities to offer a guess. pushrod, VA.