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P1181 and P1171
Getting both these codes. No idea why.
Started getting these codes after I installed the upgraded intake "snorkel" pipe and the high flow filter from GS.

I know what they mean as I have a tech 2 and have gone through most of the diagnostic steps. I changed the MAF first as I had a spare one from a 99' lying around and no change. They are the same as is listed in EPC.

Most of the vacuum lines have been replaced. No cracks, nothing disconnected that I can find. CCV lines are all attached.

Now here's the kicker, I clear the codes with tech 2 and the idle becomes fairly rough. Misfires across all cylinders at about 8 misfires distributed evenly over a 10 second period. Now, I depress the brake pedal and the rpm's rise to normal and no misfires whatsoever. I understand the brake booster is connected to the vacuum system but what I don't understand is why depressing the brake pedal stops the misfire and rough idle.

Any information or speculation would be appreciated.
 

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You said it idles roughly and misfires after you clear the codes. How does it run before you clear them? Fine?
 
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