Grill chicken on the lowest possible temperature your grill will alow, and use a meat thermometer to check the doneness, or you end up with blackened outside and raw inside.
First you should boil the chicken for about 3 to 4 minutes then take the chicken and spice to taste then place on grill and add barbuque sauce keep doing this until the chicken is done which is about 20 to 25 minutes give or take a few minutes.