please tell me what to do?? i finished the headgaskets and when i started it its missing, backfiring a little(never backfired intill i did the headgaskets) and fuleing up(if i hit the gas it blows black smoke out).i dubble cheaked the wires,redid the ic tubes twice.it was loseing power before i did the headgaskets.if im right the fireing order on the coil is - first 3 in the front (from left to right)1,2,3 and the back 3 (from right to left)4,5,6....on the motor left side front to back 1,2,3 and right side front to back 4,5,6??what could make it backfire like that and load up.could the ballancer go bad just from sitting,stuck injector?????can some help me?