When you say "the jumpity jerx," it tells me that it is running rough??? Or just not running right? My suggestions follow..... If no codes, the coils are most likely OK. If you did not replace the boots, I would do that now. There is just too much potential exposure to a ground to take a chance on a leaky boot. Next thing to check is what kind of plugs did your man put in it? If he put in Champions, it will NEVER idle right until you change to a different brand - like Motorcraft or Autolite. Next on the list is the cam position sensor. in >>most<< cases, it will set a code. In some cases, maybe not. The issue here is that on many of the Ford engines, the cam position sensor times the injector sequence, and thus can make it run not quite right. Also, the mass air flow sensor. This one can be off calibration, and will many times NOT set a code in the system. Actually, it will not set a code unless it has a major failure. Otherwise, over time, it may set a rich or lean code. Couple this up with aging oxygen sensors, and it could get to losing a lot of power and efficiency. Now for the "biggie." Fords do have a tendency to flatten out the valve seats. Causes it to run doggy and use too much fuel. The cure is a good 3-angle valve job.
I hope this gives you something to work with. Those 4.6 engines are actually a good runner when they are right.
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