I'm changing the sparkplugs on my 01 E250. On the drivers side there are 2 stainless steel tubes coming up from the larger stainlesss tube going to the EGR.
One tube has a hose attached to the housing on top of the throttle body. The other on does not an there is a port right beside the one that is attached.

I don't know if its missing. The van started hissing like an exhuast leak and was making very little power. Trouble codes PO171, PO301

Thanks Scooter