I replaced all three of my coils caused one made a miss in cylinder number two at idle.So rather than having old coils and one new I replaced all three.I bought them new from Bosch in the box from a closed down auto parts store Western Auto.I do imagine them being on the shelf for years as the price was 3 for $157.Could they have rot internally.I've tested them and they look good on a machine,but I don't know if they can fail under load.

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1999 w140, quit voting to old, and to old to fight, a god damned veteran, deutschland deutschland uber alles uber alles in der welt