* CH, you're actually better off now than before when you just had the idle rpm problem. This should be pretty straightforward. Xsbank's advise is spot on. Find out whether you're missing spark or missing fuel.
* Given all the parts and serevice you've done to this car, when you've got the engine running again, and you're back to the high idle problem, you might want to check the oil temp switch (on the block, next to the oil filter). It's responsible for raising the idle rpm when the engine (oil) is cold (colder than the switch point).

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ASE Master Tech
Quality Enterprises
Mercedes Svc. & Restoration
Sheridan, IN
317.769.3536