I have the same problem
And it might be ur blowoff vavle too
Try bowing on it from the front if you can blow thru it , that means its broke
That's why the boost spikes cuz the line is leaking
And sumtimes it revs high and boosts high
Depending on how your driving the car
Jus try to blow on the valve, you might have the same exact problem as I do,the way you described it
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