One problem related to underhood wiring has been reported for the 1997 GMC Yukon. The most recently reported issues are listed below.
Wife was driving vehicle when started to smell something burning. Parked & left the vehicle & it caught fire near the fuel tank area. Prior to it catching on fire, it was stalling out several times a day. Towed to mechanic & cause of fire or stalling was not located. Gm didn't accept responsibility for the problem.