Your rough idle and hesitation.....start using fuel system cleaner...techron, stop, whatever brand. Use it back to back , every tank 5 or 6 times...it helped mine with the rough idle. Front dif leak may in fact be oil leak from the oil cooler block off plate..it's very near the oil filter. It...
I had a Fram once that had a pin hole leak from manufacturing defect. I had owned the vehicle awhile n did my own changes regularly. So.....I didn't check oil much, if at all between changes, as the vehicle never used any. And then. One cold dark winter night I was driving looking for the family...
Well you pretty much almost covered everything my 250k + 5.3 needed! I don't wanna jinx ya...but exhaust manifold bolts and knock sensors in the intake valley too. Also, I lived in the rust belt....fuel n brake lines.
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