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It might be a case of your car running rich at the high altitude. You could carry a 3mm long allen wrench along and see if a small tweak of the rich/lean screw will make a difference. If your car is running rich at sea level it will be way rich at the high level. Your other option would be to play with the idle air bleed. Good luck!
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FEC3
1980 911SC coupe "Zeus" 3.3SS
god of thunder and lightning
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