Originally Posted by Diseasel300

Super common issue. Nothing will affect calibration. You need the splined socket to remove the delivery valve holders. YOu'll need new copper crush washers and new O-rings. There are lots of threads on this site and on the web with part numbers and procedures. Make sure everything is spotless before you take it apart.

Most critical part is the torquing. 30nm, release, 30nm, release, 30nm, final torque to 35nm.

You can do this job with the intake manifold in place, it's tight, but you can do it. Remove all the hard lines first to make it easier. Replace any broken or missing plastic clips and rubber bumpers, if they're missing the lines WILL break, usually right at an injector, or rub through where they vibrate on something else.