Thanks but yes done the TPS.
Not the codes. I should have!
Now at work but this morning I found out.
Holding the revs it still dips and picks up but when it does the fuel pressure drops 5psi or so with each rpm drop! Drops below 40psi if rev'd and let go.
See video >
https://www.youtube.com/watch?v=Q0xZ9EnoqSU