I did a trackday today and was boosting fine up to 23 pounds like I normally do. The intercooler hose popped off the throttle body a couple of times and I had to re attach it. This is not the first time this happened but this time it seems like now I can't boost past 15 psi. I have done a boost leak test and found no leaks. After I removed the tester about 30 seconds later, air even came of the tester so its definately holding. I also checked all vacuum lines and they are on snug. Any suggestions for this issue?

 

turbo wheel??. I know you say you dont have a leak check the intercooler pipe couplers maybe not connected all way around. Check manifold for slight cracks