i know its been a while since you asked for advice on idle/stalling problem, but anyway, i had the same prob. on my laguna 11. the problem is
/dirt in the
, caused by old
thinning and when this happens it gets sucked into the
which is apperently very sensative to any kind of dirty contamination. Cure is to remove
and clean, this job will cost about £25 but make sure you have the
and filter changed as well.
p.s. i also had diagnostics done which showed nothing.