I got the car about 8 months ago.

91 CRX Si with a B16A.

Replaced all of the normal stuff (plugs cap rotor wires (distributor), fuel filter, oil change coolant flush, thermostat.)

All that junk.

Car runs fine when warm and driven for about 20 minuites. But still has a slight miss, I can see the tach bump up and down about 100-50rmp and can slightly feel it miss. and I can hear it miss if I am behind the car.

Its bad when I first start it. like jums 500rpm.

I know its not a ignition problem, everything has been replaced.

So I am starting to think maybe a bad injector?

The head was just rebuild 6000miles ago.

Any ideas?

Is this common?

I just want it to run smooth at idle!