I have just fitted and HKS Fuel Cut Defencer to my my93 wrx,

when it work it is great, and fuel cut have been lifted, it used to come in at 1 bar, but now quite happily boost to 1.2 bar with no problems

however every now and again i am getting the CEL light on, and when this happens, fuel cut is hitting at about 1.1 bar.

This only happens probably once out of every 3 or 4 times i start the car, and if i switch then engine off and resart then it is normally gone and the car drives perfectly as above

Any ideas ???

Rich