Does the 560sl have a throttle cable (bowden cable) as I've seen in other posts? If so it sounds like that could be a possibility. I'm a Warraty manager at a Chrys dealership so one of our techs and I are going to take a quick peek at it during their lunch break.

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Neal

1986 560SL
2004 Chrysler Pacifica
1994 Chrysler New Yorker