My 1997 P registration Felicia 1.3 hatch has started to stall when it slows. I have a diagnostic check and no engines faults are reported. Does anyone know what the proble might be? It has recently been serviced and the lamba probe has been replaced.

are you sure it was the right lambda probe fitted also a known problem with felicia's is tight valve clearances.

Try a tempeture sender, is it only when coming to stops?

Is it an MPi? Try cleaning the throttle body, won't cost you anything DIY and certainly cannot do any harm.