Yes, meth kit will help a lot ! Usy a smaller nozzle like an m6 and drill it into the TB. Blockoff plate is a poor place to spray it in.

You can contact Kevin @ cartuing. They're selling an Alky kit now.

91 isn't all that bad, but I'd say you may want a little more fuel just in case.

You might want to do a fuel filter and some maitence too, I've always found that to kill a little KR somehow !

What plugs are you running ?

Bone stock motor otherwise ?

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Lumpy Gen 3