I agree with the stumbling idle being more of a sign of fuel troubles. If your sure your checked all the external fuel system for problems, I'd say drop the tank or pull the bed and investigate there next. Kinda sux doing this with a new purchase. It would be nice if the previous owner could help you out.
Agreed, the ghosting portion proves guilt to me. He was a well enough known member on here i believe. I hope he reaches out any day with a problem with his phone or something. But for now, i'm on my own. Definitely stings. I couldn't do someone like that, i could sleep at night!
This week through next I plan on doing these in cheapest order first lol
Cleaning MAF
Cleaning Intake
Run some injector cleaner
New fuel pump relay
New coolant sensor
Cleaning TPS
New FPR
Check ignition coils
New spark plugs
Let me Know if you guys have anymore ideas. I was told by one dealership tech its probably a blown head gasket. That has me sweating but hard to believe. No smoke, No codes, I don't hear an apparent misfire or anything. 70k miles