One problem related to gasoline engine has been reported for the 1998 GMC Sierra. The most recently reported issues are listed below.
This problem occured first in October 1998 and courtesy pontiac, where the vehicle was purchased did not find the problem! last week upon returning from new mexico the engine lost power in missouri and I stopped at a gasstation and found that there was no coolant in the tank. This was refilled and one exit further the oil was checked after the problem did not appear to be corrected. This time no oil was in the engine. Before the travel a GMC dealer in shelbyville ky did the maintenance on it, filling 5 quarts of oil in!.