So guys im having a wierd intermittent misfire on cyl 3. By weird i mean sometimes the cel will stay on and solid and reports back cyl 3 misfire along with a random sys too lean. The past couple days my car has started fine with a little rough idle and within a few minutes the cel starts flashing and stores po303 x2. After warming and driving the wideband reads 17.0 at idle meaning a lean condition right? Cel only flashes after being driven and wideband reads 17's. I have swapped plugs, swapped coil packs with cyl 1 and 3 with same results, changed fuel filter and ran injector cleaner. I am thinking the fuel injector is going bad on cyl 3 or it is dirty/ partially clogged or just leaking.
04 wrx with samco intake/ inlet. Stock injectors and pump as far as i am aware of. Tuned on 23 psi.