Pull some of the plugs out and see if there is any discoloration, other than normal, on them. Maybe it's running too rich , or lean. Listen for vaccuum leaks under the hood. You may want to bring it down to AutoZone and have the Code Scan it real quick, the computer may be giving off a code or two w/o tripping the CEL light.
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// 1998 GT-Steeda Conversion \\ -- Sold
// Now own 2001 F-150 SuperCrew 5.4L \\
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