throttle body problems

hi there all,
i am new to this forum and i came on here hoping that somebody could give me some help with my sick k11 micra. i have just replaced the throttle body and the problem i am getting is that when i start it up from cold in the morning in shoots up to about 2000 rpm when warm it goes down to about 800 rpm. i dont want to sound to stupid but do i just give the idle screw a tweak or is there more to it than that. please help me someone !
 
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