I noticed im running slightly lean under decelleration but stoich/rich under hard acceleration. This only occoured when I put a k/n conical on my T2. Should I put the stock air box back on?

 

its normal to run lean on decelaration dude, your foot is off the peddal, duh!

mine is the same way, just make sure you dont lean out when accelareating

dont put the stock choker box back on

what other mods you have by the way?

 

The ECU is supposed to go to full lean under decel. Mine goes so low it doesnt register on the gauge.