Check the timing. It can alter the idle speed.

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Andrew
300e 294,000mi
380sel 185,998mi
380se 309,980mi

While the car is running, there is a loud roar coming from the AM sensor. The breather hose from the right valve cover is pulling a stroing vacuum. If you plug the hose with your finger, the sensor stops making the loud noise and the vacuum stops. The idle does not change. Also, if you accelerate when it is making the "roar", it goes away.
Thanks
David

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2000 Honda Accord V6 137k miles

1972 300SEL 4.5 98k miles

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