Hey All,

Have a 94 C220 that has a rough idle when in gear. It idles around 500 when in gear and you can hear the headliner shaking. Very annoying. Anyway, I have replaced the plugs, wires, and MAS. Now the plugs and wires are factory MB, but the MAS is aftermarket, but was brand new.

Anyone have any idea what could cause that? Possible that I got a bad MAS?

Thanks for any help.

Jason