From the manual (shortened version):

If the Check engine light is steady, the problem was intermittent and “should” go away after 40 starts.

If the Check engine light is flashing, the problem is reoccurring and needs attention to prevent damage to the cam. May also cause damage to catalytic converter.

Diagnostics:

1) Check for cracks or leaks in all vacuum lines.
2) Check for leaks in all intake manifold gaskets.
3) Check the o-ring around the injector for damage.
4) Check the spark plug and coil pack.

If all of the above checks out, change the injector.

Probably no need for rebuild.