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Premium Member
5,535 Posts
P1101 is a maf sensor code, but can be caused by a pcv or check valve as you discovered.

In this case though, my first thought is along the lines of a aftermarket (read K&N or equivalent) air, is your filter stock and clean?
From there, the next look see is between the maf and the throttle body...specifically the hose allowing any leakage between the two.

I'll hold there for now.

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