rough idle on 190E after engine cleaning

Hi Group!
Ok...1/2 good news. changes oil and filter now engine runs smooth, with no extra noises.
still...the rough idle presists...i am beginning to think, the "bad head
gasget" wasn't it after all. i mean, the gasket didn't look to good after 160k miles, but was still funktional.
now, i am clueless, could it be an electrical problem after all? once the enigine gets going, at about 3500 rpm...power is there an it's driveable... below that rev range...there is less power an it sound like it's not igniting as it should...
i read somewhere, that someone had the exact symptoms on his 190e , an it was a broken wire somewhere in the main wireing harness..
i guess i now need help from you experienced mercedes guys again.
thanks... alex

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