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Run this in terminal:

Code:
kextstat | grep -v com.apple

Paste the results as a reply.
 
Okay, more updates. Now I've noticed that I can "force" it to happen by opening any new program. This is NOT the only time it happens: it also happens from starting up or sometimes from being completely idle, but it happens EVERY time I open a new program. I can use the program eventually, but when it's opening, the spike happens.

Additionally, this last time I tried it, I noticed the same spike to around 86% in the CPU load, but also, a process "Kernel Task" showed up with 427% CPU usage. In fact, it's happening right now as I type this from another computer: the CPU load is spiking and the "Kernel Task" is at 359%. As soon as the "kernel task" goes down, the spike goes down, and the fans quiet down.

No spike in memory pressure, though.

This is all I got from entering that in the terminal:

Last login: Wed Mar 16 11:51:44 on console

Tests-MacBook-Pro:~ testuser$ kextstat | grep -v com.apple

Index Refs Address Size Wired Name (Version) UUID <Linked Against>

Tests-MacBook-Pro:~ testuser$
 
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No third-party extensions, so that's not the cause.

I'd re-apply thermal paste before considering the more drastic conclusion that solder joints are failing.
 
Could you boot from an external drive? If it would run w/o spikes then when opening any new program, we could suspect the internal drive as possible cause. If the external drive would have a fresh install, it could also verify whether some driver or other 3rd party app might be causing the problem.
 
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