Hey guys quick question. I just recently pulled my Walbro 255 and installed a Aeromotive 340 stealth with a Racetronix Harness. Yesterday i got a SES light and the truck started hesitating only at idle. My fuel pressure is at 45-50 psi at idle and when going my AFR is 14.7 and in boost its 11.5 so there's no problems while going. Today when i got home from work i smelt gas and noticed it was coming from the gas cap so i went to open the cap and a big woosh of air came out. Any Ideas??

Codes thrown so far are:
P0300 Random/Multiple Cylinder Misfire
P0090 Fuel Pressure Regulator 1 Control Circuit
P0037 H02s Heater Control Circuit Low
P0440 EVAP Emission Control System