I've spent most of last night and today reading about DTC 49.
One thing that came up a couple of times was a write about how the coil to ignition module wire in the VS SIII and VT 304 gets interference. It should never have been wrapped up next to the hall effects sensor in a loom. This write up never had any clear answers after it as to if it worked. But I thought I had nothing to loose so gave it a go.
I ran some 15a wire and cut and soldered them together outside of the loom. Problem solved no more error.
From what I read is that when it's triggered it reverts from sequential injection back to standard non roller injection. It happens to some cars and not others. Sometimes a new dizzy can fix it or just re rerunning the wire. Anyway mind blown. Just have to find the tacho wire and bridge it up so I can see when I hit 6k.