Hi, I have a 88 300CE which stalls intermittently when it is coming to a stop or at a stop with rough idling ONLY before the stalling. I have read many posts regarding possible causes and fixes including one post suggesting that a bad distributor cap can also cause it. I remember that the problem of stalling started around after Pepboys changed my cap and rotor because I couldn't get my car started. I am not quite sure the exact timing. So I would like to confirm with you guys is it possible for a bad cap or/and rotor to cause the stall with forewarning rough idle? In addition, how can I confirm that this is exactly the cause of the problem before I purchase the new parts? Thanks very much

Rick

Take the cap off and check it yourself. You will readily see issues if the part has problems. Buy MB parts, not off brand parts from Pep Boys. I'm sure Phil has the correct part at MercedesShop.

If the cap and rotor is bad, usually you will see crusty corrosion at the dist cap contacts inside the cap, and the rotor contact as well.

Also check your coil wire and spark plug wires for wear, maybe pull some spark plugs to see if they are oil fouled.

If you replace the cap and rotor, make sure you pay close attention to the wire locations.