What do you guys make of this-

Like many among us, I suspect my ALDA is malfunctioning.

I put a T in the line between the overboost and the ALDA and it pegs at 10psi on the highway.

Then, I disconnected the line from the overboost to the ALDA to test the ALDA itself. It doesn't hold any pressure at all, nada.

Tried running the car with the alda disconnected at the overboost, plugging both disconnected orifices. Runs like a dog.

So... If my ALDA doesn't hold any pressure, it's shot? But if it's shot, why does my car run different when it's disconnected?

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1984 300CD