RE: Turbine quits at idle
Surprised no one has mentioned it, does it smoke when it quits? that's a sure sign that air is getting into the fuel line.
At Idle is it stable, or is it hunting?
Have you tried increasing the idle speed up to 30,000rpm? the increase in revs will make no difference to thrust on the groud.
I assume its a JetCat as they changed the filter as mentioned in your first post, have you tried compressed air in through the fuel inlets to clear any accumulated solidified oil residue?
Mike