Yes, definitely. The best way to combat this is to first get a feel for your own slow cooker, since models can vary in heat intensity, and also the size can impact cooking time. If you're cooking a smaller pork shoulder that's 3 pounds, you should check the temperature earlier than you would for a 5 pound shoulder. The pork is done when it reaches at least 200F and shreds easily with a fork. Try not to go over 205F.