Vehicle engine will intermittently stall or cut out at highway speeds. This condition occurs approximately once or twice a month under varied driving conditions. The vehicle will restart immediately after stalling. Several times when this has occurred, the service engine light will come on, but it will turn off after 20-30 miles of driving. This has been occurring for over a year now, I have taken the vehicle to three GM dealerships, and they claim they cannot replicate the problem. They have replaced the fuel pump at my expense, and the catalytic converter under warranty. I have also taken the vehicle to two independent shops for the same problem and they have also not been able to replicate the problem or offer a solution, other than replacing the basic components (spark plugs, plug wires, fule filter etc), which I have had done.. this is an extremely dangerous problem, primarily because when the engine stalls, the power brakes and steering also fail. I live in a mountainous region of Virginia and have had this happen while driving mountain switchbacks. This vehicle weighs almost six thousand pounds, and a loss of power brakes and steering while descending steep mountain grades with sharp curves creates an extremely dangerous and life threatening situation. Thank you for your assistance.

- Monterey, VA, USA

Left rear intake manifold leak. On a 1999 vehicle with only 48,520 miles (light useage for mom and kids) this problem seems a bit premature. My brother who owns a 1998 GMC with about 60,000 miles had simular problem. The part must be defective as both problems are very simular in nature. Cost to fix $700 to $1,000. Thank you

- Sayville, NY, USA

All these failure have been the same. There are others inclunce engine heads.

- Hillsboro, MO, USA

#7 spark plug would fail. Also, changed intake manifold & head gaskets. Problem was not intermittent. Happened all time. Took vehicle to shop for repairs & problem still exists.

- Reno, NV, USA

Vehicle has defective transmission/ engine, transaxle, ring and pinion, gear/engine bearing/brake booster/ front brake pads and calipers, and suspension.consumer feels vehicle was poorly manufactured, especially when pulling trailor or with load.

- Lancaster, CA, USA