Hey Scotty my Uncle has a 2006 Ford f150 5.4l and his engine rattles and doesn't go past 50mph when…

Hey Scotty my Uncle has a 2006 Ford f150 5.4l and his engine rattles and doesn't go past 50mph when he drives it

well, first have the catalytic converter checked, they often break down inside, rattle, then block the exhaust so engine can't go over 50. Pray it's that and not just a worn out engine.

Thanks for the response I'll let him know right away

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