I have a 92 civic with an ls/vtec the idle bounces up and from 1500-2000 and sometimes stays at 2000 I closed the idle control screw on the throttle body and nothing changes with the idle when the car warms up it doesnt drop below 1500 the idle problem just recently happened and before that it would idle around 8-900.... Need help its driving me crazy

 

looking for alittle help guys I know some of u have experienced this or know of this problem