My car doesn't have the power to accelerate

@josesalaza33446 we will need to know what exact year and exact model your MB is. Also, let us know what you have already checked. If your MB accelerate properly ones it does it could be an issue with the Throttle/Adaptive transmission. Try a reset

• Make sure that all auxiliary electrical items (HVAC blower motor, head unit, seat heaters, etc.) are turned OFF.
• Verify all doors are closed so that the Body Control Module (BCM) is not in an "active" or "interrupted" state.
• Insert the key and rotate to Position 2 (ON/Run). Do not start it!
• Depress the accelerator to the Wide Open Throttle (WOT) position (pedal to the metal; all the way to the floor) and maintain for 10 seconds. .
• While maintaining WOT, turn the ignition key to the Off Postion.
• Keep the accelerator depressed and the key in the ignition cylinder for an additional period.
• Release the accelerator pedal to its resting (idle) position. "Take your foot of the gas"
• Now do absolutely nothing for the next 5 minutes (Time to meditate :-)
• After that take your MB for a drive. Operate it under normal load conditions. Drive the way you normally drive so that the car can adapt and learn your driving style.
• Hopefully this will reset everything on your MB and you should no longer have that hesitancy.