I have a 1993 F150 with a 5.0L 4X4. I have developed a miss in the engine. I just put new plugs, wires, ingnition coil on last year. The egr was throwing a code so I purchased a new one the weekend. At low idle or when switching gears the miss is more noticable. Any body got a idea what the problem might be? I havent cleared the code by the egr yet so the check engine code light is still on. The truck has 245,000 miles on it. All original equipment except what I listed above.