alot could blow you engine from my understanding i'm changin mine come monday! ummm the 2 bolts are ur lift bolt one is to ur Intake
and the other is ur exhuast and i get a ta ta tataat rattleing type vibrations werd noise after hittin over certain rpms and but also have been noticing power loss attime but people say you should look at them every 10-20k miles but i think you can go longer... the older model 7th gens are the only ones affected with this i guess cause of the bolts they used now they use different bolts longer or more tapper or maybe less of a taper not 100% sure but if you haven't changed they i couldn't hurt to do it now just in case you know
it might not be the answer to ur prob but least ur'll know thats not the prob and can cancel that out plus don't have to worry bout ruinnin ur engine from that!
the bolts are 43cents a piece and if you are doin what i'm doin( changin everything the TSB says to) then i will cost like 35$ not much at all considering it will cost you over 4k+$ to get new engine trust me i know been there done that no fun but it wasn't from the bolts but i know mine need changing !
good luck anything else let me know!