I have a 2005 Excursion with the 6.0. It has a 4 inch down pipe back exhaust no muffler, pcv reroute, Power Hungry Performance ficm mod and 50 hp tune. When idiling the rpm's are surging up and down. This just started after recently installing a Sinister EGR delete, blue fuel spring & updated turbo oil feed line. Not sure the problem is connected to any of the new parts but wasn't doing it before hand. Thanks in advance.
Yes on the new parts & custom tune. I didn't install the parts myself had a friend of mine that's a Ford diesel tech. do it. Asked him and he didn't have any ideas off the top of his head.
Haven't had it hooked up to the scanner yet. Haven't had time to get to the dealership. Just looking for some ideas to start looking at. It is getting close to my oil change interval any chance that has anything to do with it?
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