I know this may sound a bit stupid but pull open your intake and take a look around. It's possible with "some" of the items you've named that something can be trapped in the intake area. get a flashlight and take a look past your thr-body..... If something is obstructing then you'll get all sorts of issues. Make certain that your butter-fly is working smooth while you're in there.....
Worth a shot anyhow.
-Eli