Agree with RF Overlord.
So you can confirm on your own, you can use the poor mechanic's stethoscope: take a long wooden dowel or good length screwdriver and put the tip to the injector rail and the handle to your ear. You'll hear that Singer sewing machine sound amplified by about 3 to 5 times. Normal on a 4.6
2005 Lincoln Town Car Signature Limited
5.4 liter throttle body; PI oil cooler, intake tube & air box; Mark VIII aluminum driveshaft; Trac-Lok limited slip; Richmond Gear axle shafts; J-Mod with Sonnax valves; Limo rear control arms and a great sounding stereo that won't ever automatically remember my Bluetooth settings
1999 Mercury Grand Marquis (gave that to youngest son, and he's now a converted true believer)