My ef with a b16 swap sometimes idles really low when warmed up and today it even stalled when coming to a stoplight. It would also sometimes stall about 2 sec after starting when warmed up. I have solved both these problems temporarily by doing the idle adjustment procedure and turning the idle screw a bit higher each time. This would fix the idle problem and be fine for one or two weeks but then it just comes back and I can't just keep adjusting out the idle screw since it won't go much farther out. Could this be a iacv issue?