340 1.4 rough ans slow idling

[Laird Scooby]

Originally Posted by Two340'sman

Today, checked the anti-dieselling valve and it clicks when disconnecting the lead when ignition is on. Also disconnected the lead to it when engine is idling, engine stalls, so valve appears to be good. Also removed it from car and applied poer, seems to work OK, gave it a clean away and put it back. Car still idles badly.

I was fairly sure it wouldn't be that valve which is why i didn't mention it beforehand.

Something that did cross my mind is it could be a partially blocked main or idle jet in the carb, often they can be cleared by getting up to ~40mph then changing down to 2nd and maintaining the speed, close the throttle for a few seconds then literally floor it as fast as possible then repeat.
The sudden shots of vacuum hitting the jets as the throttle is opened quickly can often clear a jet blockage but you need fairly high revs and hence vacuum to do it.

For now i'd pursue the condensation idea as that seems the most likely.