Once again one of the nuts from the manifold/down pipe had loosened themselves. I just got new gaskets and gonna get new nuts or loctite the old ones and re-take the test next week.

The starting problems has worsen lately. It turns over nicely so it's not a starter issue. Could be that it gets flooded from ideling before shut down and then failes to fire right up. Hopefully that will be taken care of at the same time with no extra fuel injected at idle speed.

Gonna re-check the timing, making sure I did it right. I just checked the FSM and it sais 5 dgres w/ shorted connectors and 10-14 w/o @750 rpm. Pretty sure I have an other spec note that sais 12 dgres w/ shorted terminals.
I will then raise the idle closer to 1000 rpm to smoothen the run as well, if needed.