Thus the reason for troubleshooting rather than just throw parts at it, plus you lose the lesson of working through issues and resolving them in an organized manner. Sorry, not preaching just my personal way of accomplishing the end goal.
One more thing to check that I can think of is the vacuum hose coming off of the back of the TBI, pull it and check it for splits in the hard hose as well as the boots on both ends. I believe the loud air sound you are referring to is a product of no air cleaner housing mounted on the TBI. Put it back in place and see if that's what it is.
I'm not sure what that connector is but maybe someone else can chime in.
One more thing to check that I can think of is the vacuum hose coming off of the back of the TBI, pull it and check it for splits in the hard hose as well as the boots on both ends. I believe the loud air sound you are referring to is a product of no air cleaner housing mounted on the TBI. Put it back in place and see if that's what it is.
I'm not sure what that connector is but maybe someone else can chime in.