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Unpredictable idle RPM

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Old Apr 13, 2016 | 06:53 PM
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wenders's Avatar
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Default Unpredictable idle RPM

My 1975 450SEL idles all over the place. Generally after cold start it idles @ 1100 RPM. However when I restart after about 1/2 hr, it idles @ 500 RPM or less and often stalls. Very unpredictable. What can I do to at least increase the speed so it does not stall? Any and all help appreciated.

75 450SEL
89 190D
 
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