I recently pulled a 3-burner manifold out of a LP Weber grill and dropped it into another 3-burner, but this one was originally NG. On the low setting the grill is getting over 425 temp. The entire manifold was transferred over and used a new hose/regulator and still the same issue. Do I need to replace the burners to get it to run at the proper temp? Is there a regulator inside those as well that I'm unaware of?