This morning I experience flunctuatin idle, wild, it will like earthquake, stall. and, when i WOT, it can suddenly jerk, like the throttle closed entirely.

I drive wira 1.6sohc. I tried to clean TB myself once using petrol. But during the installation etc, i broke the isc socket (crack on the cover), like, cause its covered with greasy thing, i was not sure that was a melted socket, or grease. So, i pulled pretty hard and it got a crack now. Will it be a problem? When i got my car, already got FCID installed. Should i remove it?

So what should i do? What could go wrong? Possibly ISC? and by the way, how to check whether stepper motor functioning? air flow senser function? Thanks guys.