800 is very close to what you want. But if your idle adjuster screw is turned all the way in then it is still not right. You might want to check the butterfly screw to make sure someone else hadn't screwed it in to get it to idle up. Also make sure the cables aren't too tight to let the butterfly arm comes back all the way closed. Sometimes the butterfly screws can come loose and not the the butterfly close all the way. It is just barely supposed to be off the sides of the intake to prevent sticking. Did you try closing off the brake booster vacuum hose?
Let us know.
Russ
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