hey guys. new member and having problems. i have a 98 audi a4 1.8t quattro. been doing alot of research and decided to install a k04 15 turbo today. everything went real smooth till the end of install. when i started the engine it sounded great nothing wrong. but when i started driving it down the street today the boosting was so sporadic it jumped from 7psi to 3psi to 20psi and so on and so forth. do not know what could cause this. Need Help Please.