The company that rebuilt the fuel distributor told me that the diaphram gasket that is inside the distributor had worn out and cracked causing a fuel leak and not allowing the correct pressure at low rpm. What ever the problem, the rebuild was done and it idles correctly now. Sorry I dont know more about it.

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Christopher Henkel
1990 190E 2.6 - Arctic white SOLD
1986 190E-16v - Blauswartze
1993 300CE - SOLD
2003 W208 CLK 320 Cabriolet - Magma Red