Ignition coil always needing replacing - coolant on them when removed.

What is your question?

Ignition coil (#'s 8, 6, 3) always seem to need replacing. Spark plugs, wires and coils all replaced 1000 miles ago. Coolant on plugs and coil when removed. Check engine light goes on and engine shakes...Even replaced short block 3000 miles ago. What is permanent fix or is there one short of getting another non-Ford truck. Have a 01 F-150 Supercrew 4x4.