Hey man, I have the same setup as this guy.
My tuning is from "tunemytruck".
I'm getting the same issue.
The temp will shoot from 69° to 280-350° instantly and then back down.
I'm learning that the temp shoots up if I'm putting it under a load but its not boosting A bunch.
High boost it seems to drop down and then sometimes it'll drop off when idling.
I've checked all the basics.
My big thinking is I installed a massive muffler (unhappy neighbors) which I'm thinking is causing enough back pressure and somehow pushing excessive heat under the hood and heating up the intake pipe.
I'm going to pull it off and test this theory when I get back from a road trip I'm on.
I wanted to see if you have ran into this issue since this post and was able to find a culprit?
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