I just got a strange misfire today. I had a fouled plug with my original plugs and drove it hard and that disappeared. This is a recent set of platinums that were installed. I also had a set of Accel COPs put in at the same time. Maybe have 2000 miles on everything. It doesn't throw a code yet but you can feel and hear one cylinder isn't up to snuff. It doesn't show on the vacuum guage as anything burnt like a valve. It's rather a steady reading with the idle RPM not varying more than 10 rpm either side of 580. To me it feels like something on the verge of quitting functioning. Any ideas? 02 5.4L F-150

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02 F-150 that just LOOKS stock,Trans shift kit,4.56 gears w/ Detroit TruTrac, LiveWire Pro Racer Package tuned. My baby: http://i48.photobucket.com/albums/f240/kaboom10/100_0291.jpg