You only replaced cyl #3 injector and not the rest? Why not just do them all now and not have to worry about the rest later? It's about time anyway.

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Only diesels in this driveway.
2005 E320 CDI 243k Black/Black
2008 Chevy 3500HD Duramax 340k
2004 Chevy 2500HD Duramax 220k