chevrolet colorado duramax 2.8 LTZ turbo diesel 2012

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Engine: 2.8L duramax turbo diesel LTZ 4x4 power:132KW/346lb-ft year:2012 Origin: GM under Thailand spec(same as holden colorado at Aussie 2012 spec) Ref link: http://media.gm.com/media/us/en/chevrolet/news.detail.html/content/Pages/news/us/en/2011/Oct/1005_diesels.html PROBLEM: Truck running rough, engine not stable, at 2500-3000rpm @gear 5 to 6 then blowing a lot of black smoke followed by white smoke. when acceleration pedal is off it start jerking a while, then it fine again..sounds like not enough fuel at injector. I have tasted my MAF sensor to unplugged while running, and its fine, when i plugged it back , problem came.. is that a MAF problem or MAP sensor problem.. there is no vacuum leak, oil leak, and turbo VN vacuum is fine..please advice