Can't remove Google Analytics tracking code

Hello, I installed GA tracking code a while back before I really started working on my site, and it was firing and I saw a few visitors here and there. In recent months (when I actually started working on my blog) I noticed I had zero visitors so I tried installing a plugin. The problem is I can’t find where to remove the code I installed months back when I REALLY didn’t know what I was doing. I’ve looked in header.php, footer.php and function.php and I don’t see it, but when I look at the source code, there it is. Can anyone provide me with assistance? I’ve since contacted my theme builder and I know the CORRECT place to install the code, but I want to remove the old stuff first. HELP!!!