Honestly I can't say for sure yet, because my idle has been bumped too low, and I've been having stalling problems thanks to the same moron at the machine shop. Once we put it back to where it was IDLING FINE PREVIOUSLY
I'll let you know for sure what's going on with it.
A chip probably wouldn't hurt anyways, especially if your check engine light is on bc of an off road H or X pipe. Personally, I'm reinstalling my cats, but having a chip custom done may be worth it if you have the dough. People are usually split on their opinion of chips..I'd consult with a trusted mechanic.