W116, Body and Interior Specific Aid

Mercedes 240D won' shut off -adjust idle speed?

I recently bought a 1978 240D so I could run biodiesel. I heard all the warnings, so when it started to get slugish I changed both fuel filters. It runs much better now, and has more power, but when I turn off the ignition the engine won't stop running - even after I remove the key. I tried reducing the idle speed with the key-shaped knob on the dash, but that wasn't enough. Does anybody know if there's a way to change the idle speed under the hood, and how to get to it? Adam

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'84 300CD Power loss

I've got a Turbo 300 CD Coupe that I've just purchased about 2 weeks ago. It's got about 270,000 miles on it and was running great until a couple of days ago. Now it seems to hesitate a bit (stutter) at speeds arounds 60 mph and if I'm going up any sort of hill it slows down pretty dramatically, like to 35 or 40. Also am noticing a bit more roughness in the idle. Anybody have any ideas of what it might be or how to diagnos this?

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