Update:
I mentioned that I occasionally got a pulling-away stall when the engine was cold. This developed into frequent cold stalling, including on the over-run when slowing for a stop, plus increasingly hard cold starting and occasionally dodgy hot starting.
I had a dig around on the Holley Sniper forum and it seems I'm not the only one with this type of problem. Suggestions were to check the Coolant Temperature Sensor reading vs the Manifold Air Temperature via the supplied HandHeld screen, as the OEM CTS have, in some cases, been shown to read high on a cold engine and low on a hot engine. On a cold engine the IAT read 55*f but the CTS read 71*f.....too much of a discrepancy. It's a common sensor type (Standard Motor Products TX3 or equivalent) and I had a spare which was known to be good. I swapped them over and all was good, with now only a 1*f difference.
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