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I just did the timing belt on my 05 IS300. Timing belt, water pump, thermostat, o-rings, tensioner, pulley, valve cover gaskets, spark plugs, and a lot of the vacuum lines were all replaced. Before the engine was starting rough and giving cylinder misfire codes. Two days after the job it is starting rough again. When I took the throttle body off I could see a collection of oil in the valley between the valve covers. When I pulled the plugs out the boots were wet, and half the plugs were wet. I wiped everything down when changing the plugs.
Any ideas what could be causing the misfire? Should I do new coils? Any help is much appreciated!
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