Brake Electric Antilock problems of the 1996 Chevrolet C10

Engine revs up when engine is cold and idles down the road at 35 mph I first reported this to the dealer soon after I bought this truck and was told that it was the way a 5. 0 l. Engine operated and nothing could be done about it after several near crashes because of the rpms of the engine as I have approached icy intersections because the wheels would be pushing me and the brakes would lock up I would have to shift into netural to keep from runnng into the intersection, after 5 years I have this is a safety hazard and the dealer may have been in error as tho the problem or otherwise. This has happened several times (the icy roads) am I the only one having this problem?.