I've searched the archives, but not found anything tangeable enough to help me. My idle speed varies from 500rpm - 650rpm, which is a bit low for my taste. I'd like to bump it up about 100rpm. Can someone tell me where I can find the idle adjustment for my car?

Thanks!

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1987 Mercedes 300D ~200K (Greasecar & Biodiesel)
1993 Ford F-250 7.3 IDI diesel 165K (Biodiesel)
1996 Thomas/International Bus with DT466 engine