Hey Folks, My 03 LB7 is making a strange harmonic noise when its cold. Seems to be coming from drivers side front but I cannot pin it down. Have heard this same noise on a few other LB7's. Thought maybe it was power steering, but not the case. Seems to go away when its up to operating temp. The idle surges a little and has done so since I bought the truck. Has lots of power. Started doing this after all 8 injectors were replaced. Any Ideas?