hey well, my SC400 has been acting wierd lately

it started hesitating and idling funny, I was sure it was a vacuum leak because it happened just after cleaning the EGR and replacing the intake manifold

the hesitating turned into misfiring while driving, and a really lumpy idle like one cylinder wasnt firing. So then I started looking at the coils or wires (plugs are 9000 miles old)

then I pulled a 2-5 code, which means the car is running lean, I am thinking of fuel injectors, but am not sure

any other suggestions?