Misfire Issues

Blakeasul

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Jul 6, 2020
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2005 Chevy Silverado 2500 6.0L
A while ago anP0300 popped on and it a very rough idle and also when I’m hauling a heavy load
the lean codes were 18-20 positive
I replaced spark,wires,intake gasket,fuel rail and injectors
The code still Persisted but the lean went to 8-10 negative
I’m not sure on what to do next?
 
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