Power loss!?!?

Zcross2758

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2006 cobalt ss sc
Zzp stage 3 supercharger kit
K&n typhoon cold air
Zzp 3" manifold back exhaust
I lost power but it's still building boost according to the gauge it hit 20 psi and the check engine light came on and gave me a p0300 code the car doesn't seem to be miss firing and the supercharger seems like it's whining funny any help would be greatly appreciated I need the car going again asap
 

YelloEye

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How many miles? Last time the plugs were changed? Oil? Clean air intake filter? How's the serpentine belt looking?
 

Zcross2758

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It has 175,000 on it and I just did a full tune up maybe a 1000 miles ago if that and the belt looks good
 

Zcross2758

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No codes at all I cleared the p0300 and no other codes came up
 

Zcross2758

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Not so much of power loss now but my supercharger is whining really bad and not building my normal 17psi
 

YelloEye

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The cat could be going bad, though usually you'll see a pressure spike because of that.
 

Zcross2758

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It's a zzp exhaust with the cat that's only 3 years old

---------- Post added at 11:16 AM ---------- Previous post was at 11:16 AM ----------

And for one quick minute right after this started it built 20 psi
 

YelloEye

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Any new parts right before this? What happened right before this started?
 

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