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when i first start my 2003 kia sorento xs auto any time of the day it mis fires and runs rough for up to 5 mins then its ok .i have 4 new injectors and 4 new glow plugs and the derv tank has been cleaned out again .please help before. i have to get rid which i dont want
 

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With what you've said I'd put money on a glow plug being down although I've never known a cylinder take about 5mins to kick in, if I was you I'd get a compression test done whilst it's cold, maybe your cylinder head is slightly warped and after running for 5mins it expands a little and forms a seal???
 

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Check engine oil pressure,if excessive (too high) this can cause the hydraulic lifters to jack the valves off the seats giving low compression,when oil gets hot it thins reducing pressure and problem goes away.If high pressure is found check correct oil is in engine too thick and it will cause this problem,also it could be the oil pressure relief valve is stuck shut.
 
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