Hello everyone, new to community and not sure if this is the right place to post this but here we go.

Rundown - My JK is the 3.6l and in the past I had to replace my oil cooler after it sprung a leak. After doing so, I began to get P0303 Cyl3 Misfire as well as symptoms and codes for an air leak (excessive air). Prior to my knowledge of the engine, I tried replacing the Inj. and all O-rings, Spark Plug, Coil Pack, and the gaskets for the intake manifold. After replacing the oil cooler, I did manage to overtighten the 7 screws that attach the intake manifold to the lower piece thus striping the plastic threads of the lower intake.

Could this be the reason behind the air leak? Seems like common sense but I want extra insight before replacing the lower intake.

Also, is there any other option available before replacing the lower intake? I've read about using epoxy and gasket materials to create a proper seal without relying on the screws. If I do use epoxy or using high temp gasket,. what would be the process?

Thank you!
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Yeah it makes sense that the lower intake is the issue. Opinion being what they are, if it were me id replace the lower intake and gasket set. Especially since you went through the effort to do all the other stuff. The torque setttings are stamped on the upper intake. 7-9nm. I forget what the lower is. In have a copy of the field service manual and can look it up if need be. If you dont have one (am im guessing you dont if you over tightened first try) get a 1/4" torque wrench with in/lbs. message me if you want a copy of the field service manual. It has the specific in/lbs settings and tightening order for all the bolts. They are supposed to be tightened in a specific order. The intakes are plastic soni believe the tightening order and torque is important so it doesnt over stress the plastic. The FSM is 7200 pages and very detailed.