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Why would your 90 F-150 4.9L start fine when cold but start hard when warm?
Wiki User
∙ 17y ago
Try changing the fuel filter at the frame rail, driver's side. I had the same problem with my 95 F150 with a 5.0L and since I changed that fuel filter, it starts ok all the time. I can't explain it, but it worked.
Wiki User
∙ 17y ago
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