Weird problem
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Tuned
Joined: Jul 2004
Posts: 275
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Weird problem
Well hopefully not weird. Maybe you guys can give me some advice. I have a 1999 F250SD with a 5.4. 232,000 miles. When I start the truck it's usually fine but when I go a few miles it starts to run rough, then after a bit clear up some and then back to rough.
Original plugs, coils and injectors. Fuel pump is my second replacement. OE fuel pump went till a little over 200K. Second one lasted a year and the current one is a year and a half old. Any ideas would be greatly appreciated.
Original plugs, coils and injectors. Fuel pump is my second replacement. OE fuel pump went till a little over 200K. Second one lasted a year and the current one is a year and a half old. Any ideas would be greatly appreciated.
Last edited by Mr. G; Jan 6, 2026 at 05:16 PM. Reason: forgot something, no check engine light
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Joined: Jul 2010
Posts: 12,055
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From: Media PA
These COPs have an excellent lifespan, I would only replace a coil that is proven to be bad, I always carried two new spares and never needed them. I would do plugs and new rubber boots for the coils though.
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