One problem related to engine failure has been reported for the 1998 Toyota 4Runner. The most recently reported issues are listed below.
Engine failed twice within two months for no reason. Both times slowing down when going to turn. No one was hurt. /// lost control of 4 runner while slowing down for exit ramp at 35 mph and wet road. Speed was not excessive for conditions. Car spun hit guard rail and then hit and did a 360. 4 days later, dry freeway at 70 mph car suddenly veered to left, spun 360 then into grass median 360 , then 360 back onto freeway and came to stop, only god could have prevented this from being a disaster. Two passengers, no one was hurt. Car covered with grass. ( dot number: tire size: 16 ).