I had low power problem once on my 85 300D. Solutions:

- First time, it was lack of boost. I used a simple gauge, but a mityvac or similar would do. Measured boost on line that connects to ALDA. No boost there?? I found that the rubber connectors on the valve on firewall that that line comes from had split. Fixed that and boost was fine. Saved having to check banjo bolt!

- Second time, I was busy, so had daughter take car to a knowledgeable Indy. Car came back running great. Bill was for $50 and said "Adjusted linkages" ! So yes, check all linkages from firewall up and replace plastic bearings or lube metal ones with some ATF. Maybe throttle is not fully opening? Can also affect shift points.

Good luck with it. My 300D turbo is still a rocket ship!

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Graham
85 300D,72 350SL, 98 E320, Outback 2.5