Washed my engine bay the other day leaving the engine running. Truck ran fine on the way home. Went to leave a couple hours later the truck wouldnt build boost. Took the boost stick off ran fine. Next day put the boost stick back on boost was up to 30psi but the turbo had a high pitch wistle when off the throtle, so was is wrong with my boost stick? I've washed it once before and did't have any problems.