6.0 diesel

February 4, 2007 12:40pm CST
I have problem with a 2005 6.0 diesel. 1 day ago it started bucking and blowing smoke under a load, but it was fine on the highway when I got up to speed. I changed the air & fuel filters and added fuel conditioner, but it did no good. Now it turns over starts for a few seconds blows smoke and stalls. Looking for help.
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