Rough idle and poor running when starting warm
 

My 190E has recently been starting to struggle to run when it's started back up warm. Once I've managed to get the car moving and up to speed the problem clears. Only have it when the car has been set for about 20 miuntes, I have no trouble it starting at 80c. I've tested the water sensor which is working but I'm having trouble testing the EHA. I unplugged it and measured 64mA at operating temp and at idle but I haven't had chance to test it cold. Where do I go from here?