I have a 98 ford ranger with the 4.0L OHV V6 with 140,000k on the truck, and there is a random misfire on one of the cylinders when you put a substantial amount of stress on the engine. Almost all of the engine sensors have been replaced, the spark plugs are fine, spark-plug wires are not worn or frayed, the MAF has been cleaned, and I have replaced the fuel filter as well as had an engine compression test done and the valves are all running within 1lb. of each other. What do you think the cause of this might be?
98 Black Ranger (RIP)
98 Maroon Ranger 4.0L SOHC XLT 4x4 5Spd Reg. Cab, Long Bed