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Cold starting,misfiring

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Hi all.my 2011 model has developed a cold starting issue.it starts immediately, but then starts misfiring,running on 2/3 cylinders.it wont rev up,and does this for a few minutes. I have spent a fortune trying to remedy it.its been into Vauxhall, and has no fault coming up.so far its had ;all new pressure sensor glow plugs,new boost pipe,boost control valve,new maf,fuel filter,dpf and egr delete (to try and solve it,not for performance lol),and a leakdown test on the injectors (all good).so i now dont know where to turn to next.all help greatly accepted!its only done 55k as well.

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