Is it an OM603?
If so there are two lines going to the ALDA, one is the boost line from the manifold and one is a vacuum line that keeps the ALDA from increasing fuel until the car is warm and the vacuum switch shuts off.
If you just pulled the vacuum line you would see an increase in performance.
If the vacuum line was pulling a strong enough signal to counteract the boost even when the car is warm pulling the lines would show you increased performance.
I would run a line directly from the intake manifold to the ALDA and see what happens.
Or you can do what I did and remove the ALDA and just plug the lines
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Monika '74 450 SL
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'97 Jeep ZJ Laredo
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