Help!

I have been reading a ton of threads about an OVP causing my problem with high and sometimes low idle. I have the 76 450 SEL and dont know where it is. Help please?

Thanks to all

Mike

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1976 Mercedes 450 SEL (170K Miles)
1999 Nissan Altima GXE (45,000 km)
1986 Ford Bronco II 4x4