Purchased the CA as a half cut and was running when picked it up. The shop had cloth obstructing air intake into air flow meter and using a windscreen washer pump to supply fuel. I assumed that the obstruction in air was because of the very low fuel pressure.

Assume it is correct ECU but ordered a 2nd hand unit today to try. Current line of thought is I damaged ECU. I will check it is a manual ECU thanks Matty.

Engine has sat for 3 years and have turned it over every few months, with a shot of oil down into combustion chamber.

Sounds like it is starving for fuel when trying to start. Fuel pump starts and then stops after 10 seconds or so. So temp wired fuel pump to run continuously and done fuel delivery test. The plugs are wet with fuel. Plus have heaps of spark. Timing on Crank angle sensor has not been changed.

Cheers Jarrad