Glad you found the issue. An air leak/lean condition will cause all the symptoms you've described. I'd have to check the parts fiche etc to confirm which part you are talking about though. Generally the airboot fits in the airbox the same way a gromet does. IE it doesn't actually have to seal against the airbox. It just pushes in and the filter seals directly against the lip of the boot. Where did you have to tape it?
You've probably noticed not a whole lot of discussion re the 4T models. Most of us are on the bangers.
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