Ismalley, you need to go back to basics. For the engine to run, it needs air, fuel, and ignition. You have been messing with fuel trying to get a slower idle. Too much or too little fuel will slow the engine down because the fuel mixture is going rich or lean. That is not the way to set idle speed. If the idle speed is to low then fuel or air may be the cause but if the idle is to high, there is too much AIR and the eha is adjusting the fuel to keep the proper mixture. You need to be looking for how the excess air is getting in. Vacuum leaks, IAC problems, throttle plates not adjusted correctly, etc. Remember, the plate you see does not regulate the amount of air, it measures the amount of air.
I am not familiar with the 190s but basic engine operation is a constant.

I hope this helps.

Paul M

__________________
84 500 SEL (307,xxx miles)