6.0 RPMs jumping randomly?
04 6.0 with 150,000 mi. the RPMs will jump up & down at idle or while driving without a load randomly. It is not doing it all the time though. If anyone would have an idea what would cause this would be much appreciated! It is bone stock. Had ECM reprogrammed at 40,000, FICM replaced at 102,000, head gasket & bolts replaced at 130,000, EGR delete kit at 130,000, & high pressure oil pump replaced at 135,000. If any of this helps. Seldomly tow with this truck anymore. Thanks again for any help!