My car is an 03' w/ a HKS TBE, gutted uppipe, Monster P&P TD-04 and Prcocess West CAI. I removed the 3/16th T-fitting and replaced it with the stock one and took my car out for a ride. Before I was having boost surging issues and after I put the stock T-fitting back on the car held boost great in 1st-3rd, but when I went to 4th the car hit 18lbs or so and I got a CEL and fuel cut.

Does anyone have any thoughts on what this could be? I reset the ECU and I'm kind of hoping that maybe the ECU will relearn everything.