Does sour have pork in it?

"Sour" is not a specific food, so it's impossible to say whether it contains pork.

To answer your question, I need more information.

Could you please tell me:

* What kind of sour are you asking about? For example, are you asking about sour cream, sour dough bread, or a specific sour dish?

* What are you concerned about regarding pork? Are you asking about religious dietary restrictions, allergies, or something else?

Once I have more information, I can help you figure out whether the specific "sour" food you're asking about contains pork.