I have heard that EGR can cause this and factory mechanics say they fail so much they replace and never bother cleaning. Do you have a catch can installed? If not, check intercooler and see if you done have a heap of oil sitting in it. It’s happened to me .....
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Jeep TJ rebuilt 4.0L, Custom Steel Roof Racks, vintage ((Jeep specific)) 15” Centerline Hellcats,
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