Mercedes Benz repair: C230 1998 acceleration problem, throttle position sensor, mercedes benze

Question
I own a mercedes benze c230 1998 model with 107,000km.Just of recent the acceleration pedal stopped functioning after series of diagnosis(actuator,throttle position sensor replaced and reprogramming was also carried on the system)yet no changes,then the fuel filter was replaced and it started working but the only problem now is that when the acc.pedal is pressed down there`s very poor performance as in response of the engine and it does not move as expected  but if it is slightly pressed it runs fine could you pls. help me out on this issue coz i`ve spent a lot to get this problem solved.

Answer
have you replaced the maf sensor or your idle air control valve.best bet is to take off your air cleaner and check all your hoses going into the intake manifold right side.I would look or google your idle air control valve?also whith the car running air cleaner off. find where the linkage goes to the throttle body use your hand and throtle it up. if it works from there it is your pedal kickdown or your accelerator cable from your pedal ..if it does bog down put some seafoam down your throttle body and retry it if not make sure you check your hoses to your idle air control valve.