have a 04 6.0l it rev up beetween 60-80 km/h, sometimes a idle the rev for no reason shoots up about 200 rpm, @ 1800 rpm or more it sounds and drives good, had filters changed recently, it has 169 000km. have extended warranty.taugh it might of been the brake module but unplugged it and the symtoms are still there after 200km drive, it did rev up once in gear idling (while mooving)in the parking lot yesterday??? would egr need clean???? the revsup are occasional especially @ 80km/h which is a speed we deal with quite ofthen around town, any suggestion before i take to dealer?????