Thanks for the lead to Steve Brotherton's post, as that was exactly what I planned to do. However....I actually just washed up from exploring the plug boot and pulling 1 plug. The boots are original Bosch, not the Beru's I have! These have an actual screw in them that turns right into the wire core as you twist it in. To use the Beru's I have, I'd need to find a dealer or someone with the little ends and proper crimping tool. That's the bad news. The good news: I cleaned up the boot I thought was shot and with the corrosion gone, it looks fine. I suppose I'll try and flog the Beru boots on EBay sometime (list at $24.00 each, BTW). Now, back to trying to find the cause of my slightly stumbling idle....

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1986 560SL
2002 Toyota Camry
1993 Lexus