idles weird

[yankees4life9115]

heres the thing my zc when it is just idling it usually idles at abut 1g-1200. but it sometimes revs up to 1500 then it drops down to 1g then it goes back up to 1500 and does it all over again...what can be causeing this???

 

[SlushboxTeggy]

Bubbles in your coolant or low coolant. Or it can be a vacuum problem. Check your coolant, fill it, and bleed it before you go any further.