OK, I got the truck back.

It pretty much got a full tuneup (it says something like tuneup kit on the receipt).

The problem appears to have gone away. I'll have to drive it for a couple of days to be completely sure. I think I noticed a bit of spark knock on the highway on the way home though.

But, it is VERY hot in WA right now and I had the AC running along with climbing a bit of a hill while I gassed it. I gave it enough that the trans dropped down a gear (out of OD). I'll have to see how things go.

I may end up at a dragstrip on Saturday. If I make some passes I'll have to see how it compares to my previous bests.

I did put some fuel injector cleaner through myself in this current tank of gas, but I'm guessing they do a bit more when the do the injectors.