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Hey guys. I put in 90hp injectors 33% over fleece injection pump with a Fass 165 liftpump I went off the guide on diesel power performance recipe for power list and that’s what they recommended for at least 700hp I have a smarty tuner on it. But when you fire it up it has a rough idle. No lope at all. I have the tune set for mild since the injectors and pump are a little big. Didn’t adjust the torque on the tuner or timing was wondering if maybe anyone might have an idea. Everything is brand new
 

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Could be crap injectors. My son put some rebuilt injectors with over sized nozzles in his Cummins and it had rough idle. He tore it apart and installed new Bosch injectors ( I think) and it runs smooth.
 

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If it idled fine before then more than likely something to do with the injectors or install. Could have a leak somewhere.


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Possibly a bad injector. Retorque the feed tubes and make sure they seated in the injectors properly.
 
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