2002 lpg poor idle / missfire

[martin lewis]

can anyone help i have 2 vans with the same problems , rough idle and low rev misfires ,no fault codes on either vehicle ,coils , plugs ,leads compressions etc all tested ,injectors all working no air leaks , only clue is spark plugs look like the mixture is very weak , 02 sensors switching OK any advice appreciated

[MrMPuk]

Do they run okay on petrol?

[martin lewis]

no they are slighty worse on petrol

[MrMPuk]

When were they last serviced?

[martin lewis]

both have full dealer history all up to date , both vehicles built in same month , further testing points to ecu under fueling ,i will post any findings

[martin lewis]

it looks like a fueling problem , the weak mixture is causing the coils to over work trying to fire the weak mixture , both vehicles at dealer now, seeing the trouble with the new models i am glad of my 1987 DI , most complicated electrical device its got is the radio !!