Hi, I'm new to the MX-6. I think I have a vaccum leak because when I boost, my boost doesn't hold. I took off the Turbo-to-Upper IC hose and put my mouth over it and blew to see if there was a leak. I thought the IC is suppose to hold pressure, no? When I blew, there was no backpressure so my conclusion was a leak. Is the IC suppose to hold the pressure? And is there a better way to test for a leak (I.E. hand pump)? Also all intake hosing were taken off and I cleaned all the oil residue off and made sure everything was back on properly and securely. I also took off the boot that goes to the throttle body and it appeared to look new (with no cracks). Still a leak...Any clues?