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Rough Idle (archive)

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Posted by John Houlden on November 04, 2000 at 10:00:23:

Can anyone offer any help regarding a rough idle on my 1989 730i. It idles roughly when cold and warm. I suppose it is more of a missfire than just a rough idle. Once you set off it is hardly noticable. I have had the valve clearences checked,changed the plugs(Bosh)leads,distributer,rotor arm,air filter ,checked all manifolds,checked vacum pipes,tried fuel additives but still no cure.Any advice would be most welcome.

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