The timing isn't adjustable on this vehicle. As far as the sync issue, I would really like to know what code was found, but I suspect it deals with the camshaft position sensor. These distributors are equipped with an internal camshaft position (fuel sync) sensor. If it is failing, injection timing could be off.
If you look at the attached picture, it shows the part I am referring to. Pics 2 and three are the directions for replacement. The first thing I suggest is to remove the cap and rotor. Make sure there is no oil getting into the distributor. The distributor has an internal seal to prevent oil from entering the distributor. If the seal failed, it could be causing the issue.
Let me know what you find or if you have other questions.
Images (Click to enlarge)
Saturday, March 27th, 2021 AT 8:35 PM