yes 2002 and later 30L are the only ones not equipped with an egr valve
its mounted under the hood on the driver side fender
I have repaired my vehicles for over 40 years, the engineers at ford have finally hidden a part from me, I have been looking for 3 weeks I cant find the EGR VALVE on the 94 3.0 liter aerostar.
Pn-40,means pressure nominal for a valve
The polaris ranger speeds are, 500engine,40. 700engine,40-50. 800engine,55mph.
Sounds like the Idle Air Control valve.
You probably have a valve sticking in the valve body of the transmission. You can try changing the fluid and filter located inside the transmission pan. When you do put 1 bottle of Lucas Lube transmission conditioner in and fill to the required level. I myself have had good results with LucasLube for similar problems.
40 intake 40 exhaust
I have a 93 4.0 and it has no EGR valve. My neighbor who is a ford mech. says some don't have EGR's and some have only one O2 sensor.