like it says I just bought a 94 C280 with 85K miles a couple weeks ago I thought I would detail the motor to make look nice and ever since then my car jerks when I'm stopped with it in drive. especially if you let the brake off to coast at 2-5mph. it really jerks, It feels like a cylinder isn't hitting or something, so I checked for water in the spark plugs that could of leaked in, and sure enough #4 I think, had about a inch of water in it, so I dried it out good. Though 100% I fixed the problem but nope it still is doing it, so I took it apart again and took out the plug but it looked fine, I have no clue what the problem is and I hate to take it to the $tealership if I don't have to????? Please help