I was having the same issues you described about a month ago and ended up replacing ignition coil on cylinder 3 and 4. It never did throw a code and I had the issue for almost a month prior to switching out the COP's. I haven't had any issues since.
So i second the weak ignition coil as...
I'm not sure what it is and haven't in the 5 years of owning it figured it out, but what you describe is the same think by 02 does when ever it 20 degrees or below outside. It will do it until its gets warm unless it's below zero outside and then it does it continually.
I only hear it when the...
I have a 02 XLT with 5.4 and 100% highway, 25.9 gallons to fill up (gas light activated) got me 349.7 miles before gas light came on again. which is roughly 13mpg. That's at 65-70mph.
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