* 4.2L Cologne V6: A relatively common choice.
* 4.6L Modular V8: This was a popular and widely used engine in various Ford vehicles of that era. There were several variations of this engine.
* 5.4L Modular V8: A larger displacement V8 option, offering more power.
To know *exactly* which engine is in a specific 1999 F-150, you'd need to check one of the following:
* The vehicle's title or registration: This document often lists the engine size.
* The sticker on the driver's side doorjamb: This sticker contains information about the vehicle's specifications, including the engine.
* The engine bay itself: The engine's displacement is usually cast into the engine block.
Without more information about the specific truck, it's impossible to say definitively which engine it has.
