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first thing you should do is get your downpipe and o2 sensor sorted so that you know that it is all set up how its supposed to be
I'm guessing by the AFM plug that you have a silvertop rather than a blacktop??
check all your vacuum lines etc and make sure you dont have any vacuum leaks or lines that arent connected, a good way to check for vacuum leaks is with some sort of aerosol, like engine start, or a spray lubricant like CRC or WD40, spray it on your lines around joins etc and if there is a leak in that area the vacuum leak will suck what you have sprayed into the engine and this will raise the revs.
another thing you can do is clean out your idle speed control valve, it's found on at the back of the head under the throttles at the flywheel end. it has two large tubes coming off it, one going into the plenum and the other going into the throttle body manifold, this valve carbons up and can cause your car to idle high, if you can get to it and take it off and then clean it out with carb cleaner it too may help.
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