I just had an engine replaced along with a valve job in a 97 disco V8. Landy seems to be idling rough, which was not the case prior to the work being completed. Suggestions? Thanks for your assistance and candid advice.

I am new to this forum and I wanted to see if anyone would be willing to decipher the follow two OBDII codes for a 1997 Land Rover Discovery. My check Engine light has illuminated and the OBDII codes are: P0138 P01193 To what are they referring? What do I need to do to correct the issue(s)...