Engine stutters at higher speeds

This sounds like a fuel issue but we need to start with checking for codes. If there are codes, that can take us in a totally different direction.

If there are no codes then we need to monitor fuel pressure when this issue is happening. If it is dropping then we know the pump may not be able to keep up.

If fuel pressure is okay, then this could also be a torque converter issue. However, we can get into that if the fuel checks out.

Okay. Great. Let me know what you find. Thanks

Can you take pictures of the screen so I can see what you are seeing? I am not familiar with that scanner but I am sure I can help you figure it out.

Okay. The video helps but first the tool is just showing you a list of all the modules that are on the vehicle. However, if the issue is that when you rev the engine in park it gets to 4,000 RPM's and then you hear is surging? Is this correct? When you said you were accelerating I thought you meant when the vehicle was picking up speed. But you mean the engine speed is increasing but you are sitting still and it revs up and then kind of surges or bounces?

Okay. This is actually normal when you are in park. This is called the rev limiter and it is there so you don't over rev the engine while in park. There is no load on the engine and if it doesn't limit this then it is possible to cause the engine to fail by causing it to run to fast with no load.

If it doesn't go over 60 MPH then this is a different issue and not related to what you are seeing in Park.

Got it. Yeah. That feature is found in higher end vehicles that have an electronic throttle. Around 2005 it became pretty standard on all vehicles but Mercedes Benz was one of the first.