Service Stabilitrak with engine light and reduced power

I've been having the same issue for some time now in my 07 Denali XL with the 6.2L. While at idle with AC on I will notice the temp rise in the air coming from the vents, the stabilitrak warning comes on, the check engine light comes on. I have a tachometer and very reduced power. Initially my mechanic was confused. So far I have had the cam position sensor replaced, the throttle body cleaned, the timing chain replaced and now it's there for a knock sensor code and crank sensor code. I read some of the other solutions from 10 years ago. I was wondering if there were any updated solutions to this problem.
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