My 85 300D (Calf) was been running very well. (Had Trap Oxidizer rplaced at dealer with oxidizing cataylst at before I purchased car, car now has 137,00 mi) Good acceleration, excellent tubo boost at approx 2300-2500 rpm etc. Was running fine on Wed. Thrs. wife took the car and complained about lack of power. I drove the car, and indeed it was sluggish and got worse. Slow starts, dead on hills and no feel of Tubo boost. Starts just fine and idles perfect. Here's the facts and what I have done to no avail.


I did not tank up during during this problem development.
Transmission still shifting OK.
Last week I cleaned out the banjo fitting on intake manifold that feeds vacuum line to gizmo on firewall. ( I believe this is supposed to enrich injection on need and with tubo boost)
I tried replacing entire vacuum line that is part of the the above item as mine was spliced and I had these exact symtoms awhile back when the line kept popping off the manifold/banjo connection.
The gizmo on the firewall holds vacuum when tested with my mighty vac.
Replaced both fuel filters even though they both only had 10K on them. Fuel was clean in both, no trace of algae etc.
Checked all vacuum lines that I could find, all appears ok.
I adjusted the valves about 9K miles ago.
New air filter 500 miles ago and it is clean.

Any suggestions as to where to poke around next?? I doubt it could be something serious to happen as it did. I'd rather not mess with the ALDA since it was running just fine.
I love this car but it's taxing my patience.
Thanks,
Gene