I adjusted the alda and got real good power off the line. A week later I decided to back the adjustment off just a little bit(less than 1/4 turn). The power off the line dropped off a lot. I adjusted the alda back up and nothing happened. I then adjusted it all the way up, still no improvment. Next I hooked up a hand pump and gauge to the alda an it holds pressure at all points from 3 to 15 psi.
I made sure all lines and fittings from the intake manifold to the alda are clear.
First do you have to remove the alda to test it because the entire system holds pressure or can you test in place? What else could be keeping me from being able to readjust the response back to comming on quicker?

Please, any and all help will be greatly appreciated.

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1983 300SD
200000miles