HEY! Absolutely FANTASTIC that you brought this up to the public eye! I honestly
should have taken a minute to better present this issue but if you couldn't tell I was a bit preoccupied with ripping the cylinder head off at that time and was focused on a steady progression there! Many many apologies on my behalf for that guys! Don't hold it against me, haha!
Just like you, I haven't been able to find any other information regarding the correct torque specs with our intake manifold bolts. I used a 10mm to pull some of them loose, the others as you may already be aware of, my hand.
If you have to, go ahead and remove that PCM, remove the bracket that holds it and do what you need to do to gain better access there. Pick one of the bolts towards the rear, whichever comes to your mind first, and give it a pull. If you found yourself in our predicament, go ahead and take that 10mm and tighten down a least one good rotation past snugness just to be on the safe side. You should be good to go afterwards. I'm telling you this because this is what I'm doing while keeping a close eye on all of them.
Call the dealership and see if you can speak with someone from their parts or service department and see what they have to say if you want to go that route!
Good luck guys, if you have any further questions, feel free to drop by our thread over at i6 head removal/engine restoration! -Octane