The error code said it was the #2 cylinder slave wire. I replaced all the plugs and wires & the coil on the #2 cylinder. Should I have changed the coil on the otherside that feeds the other plug in the cylinder? Just a little confused. The truck is running better, but the check engine light is on. Thanks for the help.

 

Have you tried clearing the code or resetting the PCM and see if the code comes back? Try taking the coil that is giving you the issue and swapping it out with another code. Make sure the electrical harnesses/plugs are tight.