Just bought a 1991 Ranger w/150 HP Mariner. Changed the plugs but noticed the plugs wires seem melted a bit, and will not idle for long in neutral without fouling out. Went on-line to buy spark-plug wires and all I seem to find is people selling the parts to make your own wires? Can you buy OEM or better yet a high performance set? Any suggestion on the poor idle problem.