need help with trouble codes

[teddybear8203]

i have a 2000 dakota quad cab with 95,000 miles on it. it has a 3.9 with an automatic tranny. i have codes p0300, p0301, p0305, and new code p0138. i have replace cap and rotor and plugs. what would make the left bank misfire on those 3 cylinders. has me scratching my head. need some more heads thinking of what to look for. thanks for your help.

[Scotty89]

Could be the plug wires or something with the fuel system. Like the injectors or the fuel rail.

[rdbchamp]

300 is multiple cylinder misfires. 301=misfire cylander #1, 305=misfire cylinder #5, 138=S2 Sensor Circuit high (Blank1 Senor2)