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Hey guys. Looking for some help here. I cant figure out why my 2007 SS/SC is doing this. The boost will jump from -20 to -10 to 0 to 5 in any random order with no change in throttle input. It will even do this in cruise control and in neutral, with my foot of the gas, and with the clutch...

I recently (May 2017) bought my 2007 Cobalt SS/SC. I didn't start having problems until a few months after purchase. I would randomly get ENG PWR REDUCED on the display and the car would run at 30% power. It is still doing this. I have done research and tried many different things yet still have...