Idle air control valve 89 jetta?

my son just got a 89 jetts his first car the idle air control valve seems to b running even after the car is off it seems to b drawing juice with the car off this i think should not b running with no power, can feel it vibrateing unhook the battery it stops hook back up it feels like its drawing juice do u need... show more my son just got a 89 jetts his first car the idle air control valve seems to b running even after the car is off it seems to b drawing juice with the car off this i think should not b running with no power, can feel it vibrateing unhook the battery it stops hook back up it feels like its drawing juice do u need this valve or is there a way u can bypass this and will the car still run also if he replaces this and it still seems to b drawing juice than what could it be and how 2 correct it need your help thank u
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