My car have very rough idling. The rpm moves up and down itself constantly.engine produces humming sound itself although no foot on accelerator. If i switch on ac, the needle gets mad...it jumps up and down very badly..
What could be the problem? Issue is mostly with petrol only...on cng, it is almost fine...
Will TB cleaning thru carb cleaner help? Is it IACV or engine sucking in too much air?
Plz advise me in detail what to do.
Its a Liana 2006 almost 110k km run mostly on cng.