Ok new issue arose. after replacing plugs, wires, and injectors the car still has this issue. No matter at what RPM when the throttle is barely open and then opened more the car stumbles for a moment and then goes. This happens whether in motion or park. Any ideas where else to look to track this issue down would be greatly appreciated. Its a 1985 190E 2.3L.

YouTube videos of engine and tach

Engine
Tach