Was not the kickdown switch I was referring to for dhjenkins.....I don't know the name of the part as I am a noob, but there is a white plastic screw under the gas pedal that connects to the throttle cable(?) and if u turn it clockwise it will increase your idle speed. Same as the cable under the airfilter cabin. If you turn it.....not sure which way, it increases the idle speed or decreases it.

No, my idle is at 650, which is right where it should be...

The modulator controls shift "harshness", correct? I know it's connected at the modulator, but I have yet to actually check the operation or that the hose doesn't have a hole in it...

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A.S.E Tech A1,A6,A7,A8 & MVAC 609 + EPA 608

Unless stated otherwise, any question I ask is about my greymarket 1985 380SEL.

That is not used for idle adjustments. Be careful to not adjust it so that the Micro Switch doesn't open and close correctly or you will affect the idle.

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1993 190E 2.3
2001 SLK230
1971 LS5 (454) Corvette Convertible

Slk230- yeah I had the idle really high, but I was able to fix it to the proper idle speed.

Dhjenkins- yes, the modulator does affect the harshness and softness (flaring) of the shifting. There is an adjustment rod that you need to turn to get it somewhere in between harsh and soft. Go to the resource tab at the top and look up vacuum modulator DIY articles. Or you can back track this thread, as whunter has posted some very helpful links. Hope this helps you. Please keep us updated on your findings.