w124 lag
 

okay, so here is an odd symptom.

if i drive my w125 400e rather hard at highway speeds, its response is great the first couple times i step on the gas, but after that (say the next time I am passing) there is a noticeable lag and i have to really step on the pedal to get any response (as in, to the kick-down), after which it down-shifts and screams off. But that is annoying. Then, it may idle a bit roughly after that once I pull off and park. As soon turn off/on the ignition, its fine again and it responds normally. Which leads me to believe its not tranny or engine related but something to do with the throttle/vacum/computer, etc.

Note, I rarely drive this way, but am wondering if anyone has a guess and whether it is something BIG, or small.

For me, my bowden cable nylon adjuster is missing. So I have absolutely no way of adjusting early or late shifts.

I have some of the problems you faced. You might want to check the bowden cable for the white nylon screw and tighten/loosen it for some effects. It may alleviate your problems..