when my b16 motor is on ,it has a slightly little misfire when its being driven or parked at about 1k to 2.5k rpm..the only changes that were done on the car was>>new clutch kit with flywheel and when i put it all together it started giving me this problem..all bolts were tighten and i have checked all plugs and vacuum hoses..what can it be???

 

plugs, wires, cap, button. also check the iac motor, if it's dirty, clean it.