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If an F-150 idles smoothly but lacks power at high speeds or under load, it could be due to several factors. Potential issues include a clogged fuel filter, faulty fuel pump, or issues with the ignition system, such as worn spark plugs or bad ignition coils. Additionally, a malfunctioning mass airflow sensor or exhaust restrictions could also impact performance under load. It's advisable to perform a diagnostic check to pinpoint the exact cause.

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2mo ago

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