CEL light in third

[JDot66]

When im getting on it and crack boost in third I get a code, a lot of the time it does't effect driving and when im done ill kill it and let it start itself on the roll. but there have been a few times and there getting closer together that as soon as the code hits its like im getting a fuel cut, hitting a brick wall on acceleration and hard backfire, havent had time to check the code but im pretty sure it will just say O2 sensor due to fuel being rich and having a high idol until i turn off cel.

my set up:
2000integra engine bottom end built
b18b1
gsr trans
93 b1 ecu
7 psi
also piggy back vtec controller to tune
check engine light only comes on boosting in third and higher gears

Any help? or any tricks to keeping it from coming on?

I did my research first and a lot of people are saying I need an after market map sensor

 

[SexySSBP]

You're boosted and only using a piggyback vtec controller to tune?!?! You need a proper tune, man. A piggyback isn't going to cut it and may easily be the source of your problem. Unless I'm misunderstanding you.