Easiest way to check spark is take a plug out and turn over with the plug attached to the lead and the plug thread earthed against the engine - I earthed mine on the turbo damper (I have the same as yours) - you can visually see the spark as you turn it over.
By the way, your engine is a work of art.
Must be so frustrating to have it looking so good and face the prospect of taking it apart again.
If you took the inlet off, there is a possibility of an air leak, but there is also the possibility that you used to have an air leak, and since you did the work, it's sealed up better, so the engine isn't getting enough air anymore.
This theory adds up too in that the engine starts when you open the throttle which lets more air in.
I recently finished a rebuild on my engine. Yesterday, I was trying to sort out erratic idling. When the engine was up to temperature, I removed my ISCV multiplug, the engine would die. I realised for this to happen, the engine wasn't getting enough air with the ISCV closed for the engine to run.
I wound out my idle screw visciously (a few turns at a time) and kept restarting the engine and then pulling the ISCV plug off until it ran with the ISCV disconnected, then set the base idle. This needs to be done with the engine at temperature obvously.
I really don't know enough to be advising you, but you could try it. Perhaps idle CO is an issue?
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