rk is leaking out and jumping to a nearby ground on the engine. Run the engine in darkness, and then watch and listen. Do you see little electrical arcs, or hear the snap-crack of electricity? Spray the plug wire ends with clean water while you run the engine at idle during this test. If you see an electrical light show, it's time to replace your Lincoln spark plug wires. How does arcing occur? Often, the issue can be traced to loose terminals. That can happen when the plug wires are mishandled during other kinds of car maintenance operations. A mechanic or DIYer can accidentally tug on the wires, disconnecting or loosening them at their boots when the wires are moved around. So when you need to disconnect your Lincoln spark plug wires, be careful! Do not pull on the wires, but grasp the plug wire and gently remove it. You can buy a special pliers for this job. Do not do this when your engine is cold, since the connectors will become looser in hot conditions.