Jeep Cherokee Spark Plug Wire Replacement - YouTube Click to view on Bing3:57Jeep Cherokee Spark Plug Wire Replacement Helpful tips to consider when replacing spark plug wires in a Jeep Cherokee 4.0 Liter. Level of difficulty: INTERMEDIATE Approximate installation time: 1.0 HOUR Motorist: Author: Standard BrandViews: 22K Changing Spark Plugs 2010 Jeep Liberty 3.7 - YouTube Click to view on Bing5:32Changing the spark plugs/coil removal on a 2010 Jeep Liberty 3.7.Author: HilltownViews: 28K Jeep Wrangler JK: Why is My Engine Misfiring? - JK-Forum Jeep Wrangler JK: Why is My Engine Misfiring? A consistent misfire will hamper engine performance and cause drivability issues. The cause of a misfire is often from a loss of spark (ignition system), improper air-fuel mixture/lack of fuel (fuel system), or a loss of compression (mechanical).