Your fuel pump is a possibility. First you need to check your fuel pressure. If you engine is a 4.6 litre than your fuel pressure should be between 30 - 45 psi, if it is a 5.4 than it should be 28 - 45 psi.
Check the fuel pressure and let me know what you find.
Dan
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Saturday, August 22nd, 2009 AT 3:25 PM