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Mine does that sometimes. Is your car supposed to idle at 1K? Mine is supposed to be at 700-750rpm. Should be a screw somewhere that allows you to adjust it.
what motor is in your car? If its a turbo, check for boost leaks, mine was doing the same thing for a while and i sealed up all the small boost leaks and now it idles perfect.
i had that problem also when my engine reved from like 1.5 k to 1 k at idle... i figured out i had a bad IAC Valve (Idle Air Control) and once i got that fixed it was all good.
dude dont fix it, it will make you seem like you are fast when you are idling. if someone askes what it is just smile and be like i dont know with a grin. tiiiite!