But I've been busy enjoying my 560SEL! Finally I can report with a high degree of confidence that I have remedied the occassional stall/stumble issue with my 88 560SEL. The ignition switch did not cure it. I finally searched for a used EZL (ignition control unit). I found one on Ebay. It was a SIEMANS unit. The seller offered a 30-day warranty, which is most generous. I paid $175.00.

I installed it 3 months ago. The car has been flawless ever since. I have carefully evaluated the performance while experiencing all types of conditions - especially cold/wet weather - where my stumble stall would be most prevalent.

After two years - nirvana! Thanks to the many who offerred assistance.

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Woody