Recently I purchased a high performance ignition coil, but when doing so I noticed that the coil had three prongs on it and that the wiring harness only had two wires and that's got me wondering why? Any one know am I missing a wire or is it just made that way. The auto parts store said that a new wiring harness has three wires so were is my middle wire.Any suggestions would be great.(4.3 v6 98 model sorry)