Hi guys, just need some help here.

I have 00 Si. (B16A).. and currently have rough idle. and even stall sometimes. I have already replaced all the spark plugs, and wires. also ditributor rotor and cap. THe problem still occur. I currently have 60,000miles on my car but havne't flush coolant yet. If it's not the coolant problem... whats your suggestion?

unstable idle just happen itself lately.. haven't done anything to car.
i got Cams, cam gears, I/H/E, VAFC.

Thanks
and sorry for the long post.