What else could be the problem? I have changed the fuel pump and the fuel filter on the Mec C200 W203 2007 model. The car still does the same as before mo fuel to the motor. now I have ordered the fue

If your Mercedes C200 W202 is not firing on two cylinders, and you've already changed the coil packs, plugs, fuel pump, and filter, here are a few other things you can check:

1. Check the fuel injectors: It's possible that the fuel injectors on cylinders 2 and 3 are clogged or not functioning properly. You can check this by swapping the injectors with ones from another cylinder and seeing if the problem moves with the injectors.
2. Check the wiring harness: The wiring harness that connects the fuel injectors to the engine control unit (ECU) may be damaged or have a loose connection. Check the wiring harness for any signs of damage or corrosion, and ensure that all connections are tight.
3. Check the ECU: The engine control unit (ECU) may be malfunctioning and causing the issue. A diagnostic scan tool can be used to check for any error codes related to the ECU.
4. Check the compression: Low compression in cylinders 2 and 3 can cause issues with firing. A compression test can be performed to check the compression levels in all cylinders.

If you're still experiencing issues after checking these items, it's best to have a professional mechanic diagnose and fix the issue. They will have the knowledge and equipment necessary to properly diagnose and repair the problem.

will need to have diagnostic done on it since it can be anything --bad or failing sensor to fuel pump

Check valves may be faulty in the fuel line. Your gauge may not be working properly, showing 1/2 tank when it is actually empty. Have you checked how many miles till it stops? Also try this link.
Mercedes Benz EPC Type W203 203 Class Information

run the fault codes and look for problems in the canister purge system

Have you changed fuel and air filter lately?

normally this is located on the fuel tank, some models have the fuel pump inside the tank

check the timing and also if the idle jet is opperating correctly. cold start mec could also be faulty. you can program it out

hi
low rpm/loss in power is cause by two things 1- fuel filters stop contaminants(rust,water,corrosion,sand,dirt)from entering the fuel lines if it is stuck could cause such problem 2-fuel pump also cause such kind of problems i think mercedes-benz has 2 pump if one is stopped the system will not have to needed fuel pressure and the quantity of the delivered fuel will be less than the needed one that will cause loss in power you have to check the fuel pressure in the lines.if one pump is not working change both pump because after sometimes the second one will stop and will cause the same problem again
check them and post me back to check what you found.

im not too sure about the c240, but the pump for the c200 is under the car strapd with the filter, close to the back right wheel behind the tank.

i have a Mercedes Benz C200 Kompressor , I just changed the plugs, air filter and oil filter and put new oil, but it's now miss firing badly can some one out there help?