I replaced the CPS on our 300E (which still tested within spec) and all of our issues went away. MPG's went from 11 to 22 and no more idle issues or misfiring/plug fouling. Its been 550 miles with 0 issues, not so much as a single misfire....with RESISTOR (dun dun dun) Champion plugs in it. 
It starts up MUCH faster too, crank....Vroom! Right away. Its awesome!
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-diesel is not just a fuel, its a way of life- 
'15 GLK250 Bluetec 118k - mine - (OC-123,800)
'17 Metris(VITO!) - 37k - wifes (OC-41k)
'09 Sprinter 3500 Winnebago View - 62k (OC - 67k)
'13 ML350 Bluetec - 95k - dad's (OC-98k)
'01 SL500 - 103k(km) - dad's (OC-110,000km)
'16 E400 4matic Sedan - 148k - Brothers (OC-155k)
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