Thanks all. I still may get that heat gun, as I probably should have one anyway. Willing to give it a shot just to see if there is any drastic temp differences. I may even take off a stack to take a look at how the throttle body looks inside. If its easy to do, I suppose I could look into each throttle body because the manufacturer said sometimes those valves can bend with a backfire. It looks like I just unscrew these couple of screws on each side and the stack should come off.
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