1-5-4-2-6-3-7-8
This means that cylinder #1 fires first, followed by #5, #4, and so on.
It's important to note that:
* This firing order applies to both gasoline and Flex Fuel versions of the 5.4L engine.
* The firing order may be slightly different for modified engines, such as those with aftermarket cylinder heads or camshafts.
* If you have any doubts about the firing order for your specific engine, it's always best to consult the owner's manual or a repair manual for your model.
