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I knew it was a misfire. If you've washed the engine you probably seeped water down in the spark plug holes which will create random misfires until dealt with(for some reason it wont evaporate). Check the connections on the ignition coils and peel back the wiring harness tape a little to check for breakage in the wires. Otherwise you probably just need a good set of spark plugs and if that's not the case grab a cheap set of china made ignition coils for 100 bux with all the wires and junk. The OEM china made coils I got from ebay are handling over 300hp on my e320 with no problems.
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