Hi,
i've got a 2.0 dti vectra that misfires when its started, but only does it when car has been stood for a while (6 ish hours) doesn't matter if glow plugs on or not. There is a white cloud of smoke when this happens, unburnt diesel?

i have had starting issues, that don't seem too bad now (touch wood) replaced glow plugs and module, bleed back pipes and t peices, injector seals, fuel filt and seals, coolant temp sensor, battery, cleaned egr etc. but still got this misfire.

only happens when car has been stood and doesn't go away when reved. have ran injector cleaner through system and ran a full tank of ultimate diesel through but still no better. Got no codes when done diagnostic check.

Was thinking bout replacing fuel filter housing, but thought i'd check u guys for ideas first.
Thanks in advance for your help

Jono