Ever since i've had my SC when i give it throttle in park it will idle up then when i let my foot off that throttle it jumps down to about 2000RPM and holds that idle for a few seconds then it will kick down to normal. i never thought much about it untill i put the 5speed in and now when i press in my clutch it does the same. im not sure if this is a normal thing on a supercharged motor or if maybe i have a problem?