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Crazed rough engine

hi all hope someone can throw some light on this issue, i have a alfa 147 jtd 16v multijet and when i start my car and leave it ticking over for a couple of minutes it starts to run lumpy allmost like its got a misfire when you increase the revs it eventually clears and runs fine i have noticed aswell when driving along slowly with throttle just pressed it feels like its hesitating untill you put foot down harder then its fine, any ideas would be good cheers
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if it were my car i'd check the following:

* air intake pipes for cracks

* air box for broken screws in lid

* disconnect the maf sensor to see if it makes any difference although at lower rpms doing this will make the idle worse.
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Hi Multijet, did you ever get anywhere with this? I've got the same on my 156 but wondered if you ever found out why before I go looking. Thanks
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I think it's the MAF

But I would also clean out the EGR valve and MAP (boost pressure) sensor.
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156 1.9 mjet 16v

disconnect maf and see if it feels better drivability wise
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engine , rough

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