my 1994 1.5 sohc non vtec civic lsi idles at 250-350 and feels as if it going to stop any sec. i herd u can adjust the idle adjsut screw on the throttle body. but i cant find it as my car has sum diffrent sort of intake it's a black box instaed of a pipe like the vtecs have. i have attached a pic. could any help me find this screw please.

thanks