i just bought a 89 crx si to get me around for the winter, i did a tune up too it. and yesterday at of no where it started to idle weird. it wasnt idling high it was idling low felt like it wanted to shut off but it didnt. just when im on a dead stop it starts to do it bouncing from 1000k to 800. but when i drive no signs of it. does anyone know what it could be? thanks

 

someone has to know come on guys need ur help gotta fix this problem..