This has got to be the most interesting problem I've ever seen :)
HOT or COLD, Put it in gear and it will drive, idle perfect.
Hot or cold, put in it neutral or park, 'pop' the throttle and it will stall or start surging between 1 & 3,000 rpm.
Here's the INSANE part. Van up on jack stands. Put tranny in neutral and you get this:
If neither tire is spinning, and pop the throttle it will STALL the engine.
If you hand spin one tire, and pop the throttle, its perfect and won't stall.
BTW, same trick won't work in Park...
To date, I've got new O2 sensors, Mass air flow sensor, Plugs, Wires.
Fuel system test OK, No codes in computer, Throttle position sensor tests perfect, Cleaned the Idle air speed motor, Coolant sensors appear to work. VSS works.
I can Hear the Idle responding to things like Power Steering, A/C, Transmission drag when putting it in gear. It won't stall on its own usually (as long as its in drive, or neutral with a tire spinning..)
Vehicle Data
95 Ford Windstar 3.8 From HellTake Care, James Lerch