Need Help. My BMW 530i E60 noticing low power and rpm hesitating when at stop with AC on. I've had Plugs changed, and was told may be the Air idle Control Valve. Does anyone know where it is located on the E60 N52.. Diagrams show and Youtube show a small silver cylnder on left side of engine at the DISA location. My engine does not have it. Would it be located elsewhere or is there another issue I should be looking at?

 

It could be lots of things. What DTC codes are you getting?