I e purchased my clk 430 convertible last year with 78k miles after one week I felt like it was loosing power it was my MAF I replaced it with a oem Bosch
Fixed my problem After I little while cel came on saying 3 cylinder misfire I changed all 16 spark Plugs and 16 wires and still after 2 days cel came saying the same thing it was a oxygen sensor I replaced when the car had obout 88k miles fixed all the problem so I got like 90k miles on my car now and and cel came on saying MAF and 3 other cylinders on the passenger side now before was on the driver side I changed the Maf under warranty then the car started missfiring at the red light and dye out sometimes and now when Im flooring it feels like hesitation and loss of power like any small little car will leave me like 2 cars behind I'm very worried I already spend alot of money and I know it's not my MAF or my spark plugs all parts purchased from dealer I'm going crazy all ready I really like my car and I hope it's not the engine or my cat please suggest

 

My guess is the coil packs may be bad. Any chance you switched the ones from the Driver to passenger side when you replaced plugs? Easy test. Swap the driver / passenger side packs. if its bad coils then the problem should follow from one side to the other. Good luck!

 

Well I'm disconnected the battery for 24hours and then plugged it and car runs like new again if I still have that problem I will switch the coils