^^ i used this stuff called demon shine its fantastic you just wash the car,dry it, then spray this demon shine(i used a spray container what has pressure in it so it sprays on, on and then dry it and that is the result you get ;)
yes correct idle conrtol valve the grey plastic bodge on the side of your inlet mainfold, trust me take it off,clean it with carb cleaner then try if still has the same issue buy a new one jobs a sweet un
defo the best coileys for the starlet in my opinion, really gives a comfy ride and they go pretty low low low low...still had loads more to go lower as well!