[Guest]

idles drops when pressing break especially when engine is cold getting worse and worse and now the engine light goes on and off sometimes I changed almost everything, clean throttle body , ngk sparks plugs, cap and rotor, and o2 sensor( how tight should it go on?... any other suggestions any one maybe it is abs it .... it is getting a little annoying

 

[AZ 2K SE]

It sounds like a vacuum leak. Ckeck your v-hoses.