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Running Extremely Lean at WOT above 4500RPM HELP!

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civic619

20+ Year Contributor
150
1
Feb 17, 2003
I am having issues with my car going over 4500RPM under WOT. My o2 volatage readings are out of the norm. From 1k to 4500rpm My readings are at 0.96v, then after 4500rpm the value start dropping fast... 0.76--0.66--0.42--0.33--0.21--0.12--0.02 and I start to feel my car hesistate.

Any ideas as to what could be going wrong?

Im pretty much stock except for the following:
Ported 14b, Ported 02 housing, 3" turbo back apexi n1, 15psi mbc, rewired FP, injen intake.
 
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