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The AFM shouldn't affect idle..I've had mine unplugged for a while and didn't notice any difference (unless it was already broken beforehand!)
Yes, I think it's main purpose was to relay data to the EGR with regard to how much air was passing through it.
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Dan
2005 E320 CDI - 246k
1987 300SDL TD05-16g, Herlevi pump, Elbe manifold, 2.47 LSD - 213k
Past: 1987 300D - 264k
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