Hello, I also have a 2000 windstar mine had 93,000 other the a powersteering pump I have only done routine maintenance. Anyway while reading your thread I happen to have my Hayes Manuel sitting right next to me and here is what the troubleshooting says.

section7 "Engine starts but stops immediately"

1. loose or damaged wire harness connections at distributor, coil or alternator.

2. Intake manifold vacuum leaks. Make sure all mounting bolts\nuts are tight and all vacuum hoses connected to the manifold are attached properly and in good condition.

3.Insufficient fuel pressure (see Chapter 4).

4. Fuel injection or engine control systems malfunction (chapters 4 and 6).

paul

Haynes North America, inc. 1998, 2001
Ford windstar 1995 trou 2001
Haynes Repair Manual (pg.0-21)