Engine cutting out

Range Rover Classic Petrol running lpg
Starts ok and runs fine changing over from petrol to lpg without hesitation.
However sometimes on a slow corner turning right etc it cuts out.
Starts again fine and this happens only occasionally but wondered if it could be tick over needs adjusting as on tick over its only about 400 rpm
how do i adjust tick over on 3.5 v8 petrol efi
thanks for advice

Rickover is too low, should be double that,
Is it same onlpg and petrol

my thoughts were tick over
my problem is how do i adjust the tick over
know on other cars how to do it but the classic is all new to me
any help appreciated
thanks

found adjuster screw on top of plenum chamber
took revs up to 650 plus
test drive not cutting out so lets see what tomorrow brings maybe just maybe its cured

Controlled for lpg and patrol are different which one is low

both but seems ok
need to drive it this morning just to be sure