Hi guys,i have recently fitted an SX FRP along with other choice mods but since its been fitted the car won't idle it doesnt go over 20 mph without trying to cut out,stalls everytime i stop and tonight did 1/4 of a tank in about 8 miles.The SX was set up for 3 bar atmos and it replaced the standard OE reg.The car hasnt been remapped as yet,but is there anything i can set on the apexi commander that will enable the car to run better until it gets mapped,or is the running problems completely unrelated

any help grateful