Originally Posted by ROLLGUY

It sounds like your IP is not getting input from the manifold. Either your banjo bolt is clogged, or the overboost valve is bad. Most people here just bypass the overboost valve. I usually check the system this way: (1) remove the banjo bolt on the ALDA and set it aside (don't loose the washers). (2) start engine and rev up to about 2,000 RPM and hold. (3) put your finger on one side of the banjo, and hold the other side against the hole in the ALDA where the bolt goes (completing a seal as if the bolt were holding the banjo on) and then release. If everything is clean, the engine should rev higher with the banjo on, and drop back down with it off. If there is no change in engine speed, there is still a clog somewhere.