Not a major problem, but annoying none the less...

My 78 4.5 with K-Jet, idles in drive at about 700-750, which from what I read is normal, however my neutral idle is around 1000-1100 RPM I tried turning the idle down but the screw is all the way in (CW) Is my Idle Air valve stuck or leaking? can it be removed and bathed in carb cleaner?

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RIP: 80 300SD
RIP: 79 450SEL
2002 E430 4matic (212,000km)
2002 ML500 'sport'

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