I mean the possibility of the IPR having issues besides the nut. Electro-mechanical devices can end up with a dead spot in the range that comes and goes.
Just thinking out loud.
I use the thin steel shim gaskets (reusable) and ultra-black RTV (thin coat both sides) and have no issues.
Edit: should be a spicer 39697 or felpro 55328
For the trucks, there are two main shapes for the diesel rad. The less common 'wide' format uses a standard gas style rad support; and sits above the frame rails. The other is the 'square' format that needs the rad support with the dip in it, and reaches down between the frame rails.
There is...
IME, mechanical damage is usually already done, and you won't unstick anything with penetrating oil anyway.
Penetrating oil may help if cylinders/rings have seen some moisture and its a "light" stuck.
I get most of my oil/fuel filters from rockauto. I find theres often clearance deals on some lesser-known brand... then a little googling reveals its made by a major mfr in the usa or europe anyway.
2wd or 4wd?
If the pump if sucking air, or lost prime, the foam build-up can push the cap off.
Is the vibration related to road speed?
Steering links (drag link and tie rods) need to be free of play, and greased regularly. Worn ones affect your wheel alignment and cause uneven tire wear and...
Ok, just checkin. I had a longwinded troubleshooting runaround with my '97 E350 some years ago. Changed and tested many things, but finally a used hpop and new ipr together made all the difference to get past hard-starting.
Google: "tie rod end" boot
Lots of options.
Its a dumb thing to fail you on because they are mostly cosmetic. Grease more frequently to keep dirt and grit out.
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