if all else fails. If you can get your hands on a cooling system pressure tester. You can pump your cooling system to spec (16psi) on a cool engine and look around to see if you can see a leak. Also watch the gauge to make sure that it always stays at 16psi and doesnt bleed down. If it...
The carbon canister collects extra fuel vapors inside it. Once you turn your car off unused vapors are stored in the carbon casnister. So when you start your car again those vapors while eventually be used. Weather or not youll pass i am not sure. I dont see why not you would just be venting...
speed density system dont really compensate for changes very well. It's recommend to go to a maf setup since a maf can read the changes in air flow and tell the pcm to compensate for the extra incoming air.