Even heat is the holy grail of grilling, but it's often not what your burners deliver. To identify the heat pattern, cover grates with slices of white bread and run burners on high for a few minutes. Cut the flame and flip the slices to see which toasted most, indicating where the hot spots are. To even out the heat, add grates of hard-anodized aluminum, an excellent conductor, like GrillGrate
(about $40 and up). Or place indirect-heat food on cooler areas and direct-heat food on the warm ones.