My system does not appear to have any vacuum leaks that I have detected: 18-20 mm Hg at the intake on various test points. I checked all of the test points and all held vacuum. I replaced all the plastic and rubber hoses again for peace of mind including sealing all the injectors again. All check valves are functional. Sprayed 2 cans of carb cleaner around the engine for about 45 mins checking for idle change and got nothing. However I too my car to a long stretch of road in the middle of nowhere and started toying with the fuel-air mixture again. I had to lean the mixture out a good amount in order to get my car where it is now at. So now, my take off/acceleration is superb! Not sluggish at all, very responsive/quick. The downside is this: #1 my IACV is still disconnected because if it gets connected the idle is way up to 2500 rpm. Also, sine the car is leaned out so much I have to give it a little gas to get it going when starting it. I did richen up the mixture again just to be sure and he start up was great. one crank and it fired right up, but then my acceleration suffered greatly, so I leaned it out again and left it like it is. I am still searching for the answers daily, but I need my car to drive safely so that why I am leaving it this way until I can find more info......8-10 seconds to get across a 4 lane intersection from a red light is not ideal,

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1990 190E 3.0L