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Discussion Starter #1
03 6 blow fires right up everyone but very runs rough till warm. Once warm from 1500 to 2k falls on its face and the truck shudders. I’m not throwing a CEL, I’ve tested the FICM, it’s at 48V running and cranking. I’m thinking possibly a fuel issue. Has anyone ran into this?
 

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Compression Ignition Addict
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I would bet you have a code probably an injector contribution code.
 
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