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I have a 380sl which intermittently under hard acceleration will not rev above 3000 rpms it will even do it in park. checked voltage at coil when happening voltage drops at 3000 rpms
 

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1984 300D turbo 1982 380SL 1981 380SL 1984 300SD
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2,331 Posts
Tachometer and fuel pump relay are both involved in limiting revs. if it seems to be an electrical issue.
 

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1984 380SL
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2,287 Posts
Yes, full throttle is supposed to cut out mixture control and some other stuff (I forget). Check the relays.
 
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