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The 2004 Ford F-150 5.4 doesn't come with an EGR valve. Spark plugs should be changed every 100,000 miles unless they're copper, in which case, they must be replaced every 30,000 miles. Your air filter should be swapped out every 15,000 to 30,000 miles, and the coolant changed every 60,000 miles. You may encounter various engine issues like loose gaskets that need tightening, spark plug malfunctions causing engine problems, and the serious issue of engine overheating, which can lead to fires and even explosions. Excessive oil consumption might necessitate earlier oil changes, and any oil leaks should be fixed promptly to prevent further damage.
The 5.4L engine in the 2004 Ford F-150 doesn't come with an EGR valve, unlike the 4.6L engine.