Ok. I agree with you 100 percent. I hooked it up a scanner , I found something I couldn't see each injector. But I have combined from the bank 1 and the bank 2. I going to add the chart down below. I used two different scanners but probably they have the same software so I got very similar results. The only thing I have is the misfire on number five which doesn't explain what they had the codes for one and 7. Next week are going to make it appointment for our mechanic that fixes our shop vehicles. We mostly have GM, different kind of vans. There's also one thing that bothers me is that hissing sound . I can not determine from where it's coming. I going to order just in case new injector and try to replace it. But I wonder can I replace the injector without removing the whole manifold and that fuel line the whole thing????the throttle body is just a air valve these days.. there's no fuel running to it like the old days.
that's why I was wondering if the spark plugs in those 2 cyl were wet with fuel. that could mean the fuel injectors for those 2 cyl are stuck open a bit. you might look at the fuel pressure on your scanner. it should be 45-50 psi running and when it goes into auto stop, it seems to creep up, I guess from the heat build up. but if you see it falling pretty quickly, you might have a leaky injector.
is it possible what you're seeing is oil? these ls engines without the upgraded oil baffle in the valve cover are known to suck a lot of oil in to the intake. it tends to puddle around places. it's not great for the engine but doesn't normally cause big problems.