Wife's 1988 300E occasionally experiences a no-idle problem. Must left-foot brake and maintain revs at 1000 or it dies. Happens intermittantly now, but suspect it may become a permanent condition. Can anyone suggest where the problem is?

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Kent Christensen
Albuquerque
'07 GL320CDI, '10 CL550. '01 Porsche Boxster
Two BMW motorcycles