Yes.See "Related Questions" below for much more about the Windstar EGR / DPFE system.
A 1998 Ford Windstar would use refrigerant 134a
you have a cylinder misfire
You may want to check the IMRC's which control fuel flow on the intakes. These went bad on my 97.
Replace freeze plug in a 1998 ford windstar ?
Not likely - the 1999 Windstar was a rather significant updating of design compared to 1995-1998 models.
Morgan
The horn button or relay could be stuck. The most common cause is the relay sticking closed, as opposed to the button.
a rough road can cause the fuel shut off switch to turn off
Yes. Without proper timing the engine will never run.
On a 1998 Ford Windstar : The 3.8 liter V6 engine ( and the 3.0 ) has a timing CHAIN
Not very likely - the Windstar was significantly redesigned in 1999, and the dimensions of the vehicle were changed.