Right so, after changing:
Fuel filter
Fuel pump (thanks Murray)
HT leads
Coil pack
Air flow meter
Sensor thing next to the air flow meter
And fresh petrol
It still wouldn't run, so I called in back up in the form of MVR who was the guy who initially helped fit the engine way back in 2010..........or 2011 I forget what year it was. Marty turned up at 9pm on Wednesday night, stuck it on his trailer and text me on Thursday morning to tell me that was it up and running good as new.
So went and picked it up and it's running better than it has in years, whether it's all the new parts fitted or whether it was the initial cause remains a mystery but I'm very happy with how it is now.
What was the problem then..................................
a blocked catalytic converter.
Marty noticed when it was cutting out there was exhaust fumes coming back through the air flow meter so he stuck it on the ramp and disconnected the lambda sensor and the revs picked up. He removed the cat and it ran perfectly, so with the cat suitably disposed of and a straight pipe fitted it sounds and runs great.
So why didn't I think of this? Easy answer, I forgot it had a cat on it. I think it was 2016 the cat got put back on because it failed an MOT on emissions, so it's been there since then and I had no idea. It will never see the light of day ever again.
There's still plenty of bits of engine lying in the boot I haven't put back on yet but I've been busy with other things.
Stay tuned