i recently ported and polished my head and intake manifold, i installed Gude cams and factory valves, springs, and retainers. After putting the car back together and timming it it runs fine with a good solid idle, but after it is warmed up if i stop at a light the idle will go down to around 400 jump back up and be solid again, the check engine light comes on and i get a code 43 for the fuel sytem, i have no leaking injecotrs or anything and i was wondering if i am running to lean or rich, there is no pining so it cant be that leaned out. i was also wondering if maybe i should upgrade the injectors.