So ive went back to the standard FPR and my car is now idling at an afr of 11.4, its also at around 12-13 when crusing at 60mph. Obviously this is way too rich, but the car is fine at WOT. Ive checked everything i can think of, coolant sensor, map sensor, IAT sensor, TPS, O2 sensor. I noticed that if i remove the VAC hose from the FPR it has no affect on the idle AFR, with my adjustable regulator, removing the vac pipe made it go rich. Any ideas? Cheers