Hard to cold start

I own a 1994 Plymouth Voyager SE.

A front wheel drive 3.0 L V6 with Automatic overdrive transmision. It has 170, 000 Km or just over 100, 000 miles (original).

History:

1 - it sat for about 5 years
2 - in 2002, it was started and ran well for until last year
3 - in 2005, the A/C compressor seized on us, no more A/C
4 - in summer 2006, the fuel pump went and replaced, along with the inline filter by the chasis
5 - in late 2006, cold starting is started to be a challenge until now it just juggles and dies. Now it sat in the garage. When it starts, it would run fine when it is warm.
6 - 3 experienced mechanics tried to solve this problem with no answer
7 - sympstoms: starts & putt-putt-putt & dies with NO ENGINE CODES!
8 - things that has been replaced - distributor cap, rotor, whole distributor, water temp sensor, all spark plugs, all ignition wires, air filter, pvc valve filter, engine computer (twice)
9 - things has been checked - no engine code, fuel pressure at 45

Could the fuel flow be questionable even the pressure checked out good?

I am thinking of changing the fuel pump. Would this be worth a try? The other mechanics think not.

I've spent quite a bit of money and time. I asked another mechanic for his opnions and he jokingly tld me that there is one thing that I haven't changed. I asked what it is. He said the Van itself.

Do you have any idea?

Help,
Arohl