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smoke and miss

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Old Jul 12, 2010 | 04:55 PM
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blackestate
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From: Great northwest
smoke and miss

On a 2004 f-350 at about 2000RPM there is a big black smoke, then it misses, IF it is down shifted to get high RPM's it starts running ok again.
This is a PSD truck. and seems to be only when loaded and working.

What gives? What do I check first?
 
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