i just bought a used 2001 clk320 a couple of months ago with only 60,000 km on it i drive the car and it goes very well smooth and powerful... after 6 months on a clear road i tried to kick it off then i think around 4000 rpm the car started to get sluggish as if it feels like its going to die.. but when i restart the engine its all good drives normally except when you do high revs it feels like its gonna stall... ok so i change the MAF sensor but its still the same, i'am a very careful non abusive driver to my car what can be wrong??? Pls help i need your answers...

first check to make sure ur ur not on winter mode.if thats all set try resetting ur ecu.

k thanks but do u think its the crank shaft position sensor that is why sometimes i stall???

I changed the sensors (MAF,CPS) now its back on its feet )