Rick, I reckon once my boost is wound up mine will do the same, but for 7psi it chatters good

Fro Turbo, It's simple, take your D/V off, blank the 2 hoses with broom handle for the big one, a bolt for the small one, or jus take it and the Tpiece off and connect back to inlet and give it some right foot/lift off an see what it does