i installed an M112 supercharger on my 3.8 5 speed and im not sure whats going on. when im driving and i shift gears the rpm's drop extremely fast and makes for a rough shift. also when first starting it up it doesnt want to idle. and it almost sounds like it wants to miss. once warmed up it idles ok. i havent had it tuned yet, but i havent driven it into boost either. could it be a vacuum leak or a misrouted vacuum line?