2002 Ford Taurus 3.0L OHV: Only half of the cylinders firing

2002 Ford Taurus 3.0L OHV: Only half of the cylinders firing On my Taurus I hooked up a timing light to tell if the plugs were sparking and plugs on cylinders 4,5,6 are working great but cylinders 1,2 fire less often than they should and cylinder 3 does not fire. But its 3 coils shared on 6 cylinders so i swapped the wires to the ones that are on the same coil and then cylinders 1,2,3 were not firing right but 4,5,6 were firing great.