1987 5.7L TBI stalls a lot...

[Ecnerwal]

Engine is 5.7L V8 TBI (or 350)

Stalling a great deal. More hot than cold (otherwise the temp sensor mentioned in another thread seemed like a great possibilty). More in reverse than forward, though it happens in both - runs fine while running, but when slacked off to come to a stop it frequently (but not always) dies. If I keep a foot on the gas and fight it with the brake to stop it stays running. Seems essentially like the idle speed needs to come up, but with the computer controlling it I can't see a place to adjust that; I also can't see that it should have changed, and this used to work fine. I've been living with it for long enough that I can't recall for sure if it was sudden or gradual in onset - I'd guess gradual.

I've asked about it when having other things serviced, but never gotten a reason for it (despite getting comments that "it stalls a lot", as if I hadn't noticed, and asked them for a diagnosis or repair...)

1987 crew cab 1 ton 4wd (single rears). 131000 miles - recently made a 2000 mile trip without major trouble (did blow the same air injection check valve I replaced 3 months ago when the original one blew), and only used about a quart of oil, despite a constant slow drip which I have not tracked down the source of. Makes a small amount of blue smoke when starting these days, but only for a few seconds. Have not checked compression, etc... TH400 tranny.

Despite being in the rust belt, the price of new trucks is prohibitive, and I'd like to keep this one functional for a while longer. I've got a few other questions, but I'll separate them out into other threads.