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Here is the photo of the whole thing - with flame working (not for long, as usual):

I cleaned it pretty well, until it was shiny, but it didn't help at all. Pro guy cleaned it again, no effect...

The thing is that both valve and igniter/sensor sort of work (see original post) and can light a flame, sometimes even hold the flame for a while, but then it flames out anyway. I don't know of a method to determine if the flame sensor or gas valve is intermittently failing, but something is...

Furnace: Keeprite, 15 year old, Honeywell Q3400A1024 flame sensor/igniter module, Honeywell gas valve. Problem: blower activates, igniter turns yellow, pilot flame lights up, main burners light up, keep burning for 10-20 seconds and flame out, then after a while ignite again, and flame out...