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Message: <blockquote data-quote="godflesh" data-source="post: 135270" data-attributes="member: 2276">Gurus and old timers, boys and gals.....Checked the oil level, spot on with 4l oil. Checked all vacuum hoses, all look ok. Cleaned ICV, checked throttle body etc. Consumption good as before idling problem still getting 10-11km/l mixed driving. But that very slight roughness when idling is still there - seems very rthymic, like intermittent misfire in a cylinder. When engine started from cold, the idle is spot on and sweet but roughens when approaching operating temperature. The adjuster unit is new so don't think that would be the problem. The 3 suspects at the moment...1) New plugs Bosch F7LDCR. Not gapped, but was told they were ok out of the box, don't know how true. Should they be gapped??2) Leaky flywheel oil seal - The leak seems to be getting worse, actual oil spots on driveway. Could this be affecting the vacuum system of the engine by allwowing un-metered air through the flywheel seal?? Perhaps enough to cause that slight rthymic vibration???3) Ignition system (coils, wire etc), but car drives bautifully when accelerating all the way to high speeds, no hessitation, misfires roughness..... Any opinions would be greatly appreciated.....Cheers!</blockquote>