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07/10/2023 3:00 pm
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My 1997 f150 has started to develop an occasional misfire at startup. It has only happened about 3 times now and it has so far only happened when the engine is cold. It lasts for about 30 to 50 seconds and then runs fine after that. It doesn't do it long enough to trip a code. The sparkplugs are fairly new, I replaced them a few months ago. I haven't replaced the sparkplug wires as they looked fine, they were replaced the time before last. My truck has about 256000 miles on it.
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