Problems with 98 3.0 engine codes
I have a 1998 Ranger 3.0with 113450 on it 2 weeks ago the truck started running rough,I ran codes on it it had po 306 po 401 and a system 2 lean bank 2. I took it to a shop as I just have basic knowledge working on vehicles. They said number 6 injector was out,I paid them to fix it.Here it is again 2 weeks later truck starts running rough so I ran codes on it again it is giving me
any help here would be appreciated or what direction I should go.
I have a chiltons book for the truck and can probably do the work my self I just don't know where to start. I know I don't want to shell out another 300 bucks or more to a shop and not have it fixed.