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ENGINE RUNS ROUGH WHEN IDOL ON MERCEDES BENZ E500, 2003\015 110,000 mercd. E500 runs little rough @ all times (Engine: cold, hot) only when car is idol (first start car or @ a stop sign). Did tune-up (merced. spark plugs & air filters), did not change spark plug wires. New mercd. air filters & large bottle of "Lucus fuel injector cleaner w full tank. always put super unleaded gas. Sprayed throttle box with carb. cleaner solution. There's a slight hesitation (intermittent cut-off of the engine, as it's not getting enough gas, seat shakes a little, engine also shakes a little. Not smooth continuous flow (flawless) humming of the engine. May one of the vacuum hoses is off. Also which I've had this for a long time, there's a fast "ticking" (clock ticking) sound that seems to come from the first spark-plug area directly (closer to the front of car) intermittently. I'm not sure if I should change all spark-plug wires or have them tested. Advanced auto diagnostic tool did not detect any codes??? ANY FEED BACK WOULD BE APPRECIATED. THANKS\015
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