Re: 05 6.0 Smoking after deceleration
Sounds like it might be time for a bubble test. Remove the secondary fuel filter cap and use the wire on the passenger side to spin the engine with the key off. If you have bubbles then you've got a bad copper washer and some bad o-rings on one or more injectors. If you aren't familiar with any of this, do some searches on here and on Google. It's a fairly straight-forward procedure.
2004 Excursion 6.0
New HPOP/HPO system o-rings; Updated standpipes and dummy plugs
EGR delete; Rebuilt oil cooler; CCV collection mod
VR Black Diamond head gaskets and ARP studs
Oil and coolant bypass filters; Shell EC-1 coolant
Rebuilt turbo; 250 amp alt; 6000 watts of brain scrambling
One giant 240 pound English Mastiff riding shotgun!