Thanks for the suggestions. The wagon has 167k on it. I replaced both the filter and the check valve in Feb. I have gone through the archives and read all I could on the rough idle subject (is there a 300E/TE out there w/o a rough idle?).
My situation is strictly on a cold start up. Fires right up but idles very rough for 2-5 seconds then smooths out. My guess is an injector is leaking down and flooding one cylinder. Injector cleaner does not help. Wires, plugs, rotor are all good/new.
Replacing the injectors seems to be the next logical step. Still would like to hear from one of the Techs. on the pressurizing issue.