I recently became concerned. I hit the gas the other day, at around 30mph, and as it accelerated I heard a misfire. I have a 06 F150 SCrew FX4 5.4L 3V with 54K miles. I would not expect a misfire at 54K...am I correct to expect that I am running lean? How bad is this for my truck? (probably a stupid question) This misfire has happened twice...especially since the temp has dropped and the fuel switched to 89 octane winter gas
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