I tried a little running after a leg work out just to kill any extra energy I had in me
As a bodybuilder, this should not be the case. Your leg workout was not physically draining enough. You need to use that extra energy and focus it into lifting weights. I have what I call noodle legs after I get done with my leg workouts (and yes, I have been known to "trip" over a piece of paper on the floor of the gym on my way out). If you still have energy left over for a run, then you are not pushing yourself completely with the weights. This is where you need to work on getting a BBer's focused mentality of lifting weights heavier and heavier in order to build muscle, eating for the repair and recovery of thrashed muscles, sleeping for the repair and recovery of muscle, and finally, looking at the muscle growing from all the hard work you are putting into it.
Running is nice though. You can do it for a warmup (like 10-15 minutes at a moderate rate) before you weightlift, or at a separate time - like morning cardio, evening workout - or even on a separate day for a cardio component of your routine (like on your day off from weightlifting).