ive changed plugs/cam sensors/coil/traced all connections with no breaks. pump pressure good. replaced #3 injector. about to pull the head unless someone has an idea or fix..it just started 1 morning missing and hasnt stopped..sigh. any help appreciated.

 

did you do compression?

 

Is this an N18 or N14 car?

Pulling the head isn't going to tell you anything if compression is good.

Have you had a quality scan tool on the car yet? There is more information you need to provide, because if there is a dead misfire on three I almost guarantee there are more faults stored.