XEP,s suffer with faulty cam covers (ventilation valve) which could well be your problem.
They normally smoke a lot with a badly faulty valve.
Kev.
Message Thread 
Vauxhall Astra Z16XEP 2004 - No idle, will run with foot on gas but surges - Fixed # - Paul Howd October 5, 2010, 7:57 pm
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