A bad tank of fuel? Did the trouble start after a fill up?

Sadly some old stations have gotten away with not replacing old tanks.

 

Just just to add to this we have since replaced all injectors. Cleared codes and drove, but it still has the intermittent missing and stall.
I am adding attached screenshots of codes, and data from odb hopefully somebody can make heads or tails of it.

 

You're adding to the OP? Are you working on Ron's car?

 

All of those "not passed" means the computer was cleared and now the computer needs to run all of the OBD tests.
My guess is that you also forgot to plug the MAF back in.
You might check fuse #33 undehood.

 

Yes he's my father and we are working together on this

 

Check the MAF sensor connector and report back please.

 

Potted palm in the corner.

 

for the misfire.... is the timing correct?

 

Doubt it’s timing, more likely fuel pressure or loose coil or injector connector and or MAF sensor isn’t plugged in tightly.

 

Checked the MAF connection all pins are good and plugged in tightly. Checked all connections they are good also