Mercedise benz dont have power and its not proper eccelerated it also have rough noise

loud noise under acceleration indicates a failed big end bearing or main bearing
have a oil pressure check done
remove the injector for that piston and if it stops the noise then consider a replacement engine.

hi Jhlightcap.

The Common Problem: Rough Running Engine

A properly-operating engine should run smoothly and without excess noise. If your engine starts operating in a manner that gives you the perception of "running rough", it is likely due to a handful of common causes. A mechanic would investigate these common causes first in order to rule out a simple explanation for the engine's unsatisfactory operation.
The common causes for rough running in an engine are:

• Engine miss
• Vacuum leak
• Dirty fuel injectors
• Carburetor problems
• EGR valve
• Ignition coil
• Spark plug wires
• have a look at this link.

Rough Running Engine James on Engines 2

Hello,
I do agree with the person who mentioned
" Tire Noise". A few moments spent with a knowledgeable tire dealer will help
in your choice when it comes time for replacement,
Enjoy your Benz. A little homework will quiet it down real nice.
Wayne

make sure the vac system is operating good if vac not working properly hubs will partially engage making nasty noises.

Coils, wires, plugs, fuel filter. A real tune up in other words.

did you have any trouble with misfires or missing running rough. these are very proe to cat converter damage and get plugged up

If turbo check for inter cooler hose to be blown off or split open, also scan to see if there is a mass air meter code

chances are the power steering pump has seen better days and may need replacement. i dont recomend any additives in these systems. if its making noise, there isnt really alot you can do. dont replace the gear box unless there are leaks.

dodgy injector or wiring

i forgot to mention... no I dont believe i hear anything. the one noise that i hear occasionally is a very short "bshhhh" roughly < or = 1second. I bought the car from someone who took wonderful care of it however i dont believe the antenna was used a lot. It was slightly corroded or whatever which certainly could have caused it to draw too much power to the motor resulting in the motor burning out.

I would almost rather find out how to just take the whole thing out and deal without an antenna unless i find something reasonable on ebay.