'79 250ci idle speed adjust - truck stalls when coasting

[J1MMY]

Hi All

Just bought a '79 C10 shortbed w/250ci and TH350. I bought it as a road going project and it drives well except for one thing - once youre off the throttle and are coasting to a junction, it stalls as you brake to a halt. Everything else seems fine, auto choke is fine cold starting, Tickover settles when the engine warms up (and it will tick over all day long), drives smoothly through the gears.

The I6 is only temporary until I find a V8 (I'd prefer a 292 to convert to efi but no chance of finding one here in the UK) but I'd still like to use the truck in the meantime.

Any help appreciated. Thanks for reading.