after having gas installed a month ago there was a wierd noise coming from the intake after checking i found the ISC was doing it ,i disconected the wire the gas installers had conected and all good .the 2 wires on the ISC can anyone tell me what there for .my guess is one is main power and the other is from the computer .also the car idles really low when cold on gas or petrol even before i disconected the wire .cars an EB series 2 6cyl .