i have this problem the car ideal are 1000-1500 i know its high and the big issue is that when i roll ( press the clutch to roll in the stop light and gently pressing the brake ) the rpm go down almost to shut off the car and sometimes it does shut off. any help guys?? im thinking its a o2 sensor or spark plug but not really sure
what engine is it? is it turbo’d
i have this same prob, i think most ka’s have this issue lol, i was suspicious of the pcv, considering its under the intake manifold i never changed it and this still happens frequently, it doesnt stall but drops down to about 500 then recovers to about 800, i dont think its anything major to worry about tho
but mine go down to 0 
and yes its a ka non turbo im changing my spark plug today probly that the reason but mine is 1500 ideal and go down to 0 so trying the spark plug but any thing else if spark plug dont work?
not to hate or anything, but please stop with that smiley face or w/e, and put a little more effort into your posts, the issue is probly a combination of a couple things, plugs will prob help if the car hasnt had a tune up, then try cleaning out your throttle body, simple things like that, if that doesnt help at all then its prob somethin like your pcv valve or idle air control valve
trying this tomorrow and yea codyne sorry for the smiley icons im used to it … but yea codyne i change the spark plug and its not the problem trying what 89 coupe advices and i will let you know guys