I have checked spark.How I have checked...first all the sparkplugs out and well grounded, and when cranking all of them sparks...and second, one ignition cable, from cylinder 5 was disconected from its sparkplug, which I let in engine, and was connected a test sparkplug well grounded.I have started engine, it was running also for 2 seconds, then I must spray ISO Octane, and engine stay running, of course a little bit rough because one cylinder not working, but, spark was visible at the test sparkplug....so I guess I have a good ignition system....I don't know what else to check.This is how it starts when cold:

https://youtu.be/9IO6hgjgnRk

Have checked the sparkplug gap to be at 0.8 mm.It is possible to have spark, but from a worn ignition module, it's voltage to be low and not enough to burn fuel??
Since on the ignition system everything is new, except ignition module.