Here is the deal, the car runs fine when the boost controller is off and the vacummn sits at 20 steady. However once I turn the boost controller (Profec B) ON, the vacummn will shot to 15 with the needle bouncing!! What's the problem seems to be? Ive check all the vacumn and they are all good, vacumn reading on the boost gauge is 20 when the profec b is OFF.

Some one told me it might be the solynode or something?? Anyone have this problem with their electric boost controller before?