Vehicle instrument panel warning shows: Service traction control reduced power stability system failed vehicle misfires when this happens sometimes vehicle shuts off in the middle of the road when trying to restart it does not restart sometimes after this

- Port Saint Lucie, FL, USA

I own a 2007 Hummer H3 with 66000 miles on it. It has been diagnosed as having a bad head due to the use of soft metals for the cylinder sleeve. Due to this, there is sudden reduced power. The cost of this fix is about $4500. My truck began with a check engine light on (autozone) said it was a misfire on cylinder #5. I went to the local dealer and asked them to look at the truck. They diagnosed it as a #5 cylinder having the compression leak of 90%. in looking on the internet (at Hummer forums), I observed that quite a few Hummer H3 owners were writing in about their experience with misfires and bad heads, at about the same mileage. I think this needs to be looked into and that GM should be ordered to do a recall. This is the same problem they had with the 3.5L engines they used in their pre-2007 Hummer H3 and Colorado. I am going to write my congress rep and ask that with the problems that GM is having right now, that this also be moved forward and that they order an investigation. Any other Hummer H3 owners with the same problems should do the same thing.

- West Bend, WI, USA

Ever since I purchased this vehicle, the vehicle has stalled at between 25mph and 0. I work for the us census bureau, permanent worker and I travel through all types of weather conditions in a day, from 9,000 ft mountains covered in snow to desert gravel roads, mesas, cliffs. Over the past two years the vehicle has shut off while traversing mountain roads covered in snow with no guard rails, and three times, when the engine shut off, I lost steering and came within inches of going off the side (cliffs) of these roads, not to mention in town, when my engine shuts off as I drive, I have come close to hitting other vehicles or poles as I lose power steering on a turn.. I have to drive about 90 miles one way to get it serviced, while under warranty, I had it "repaired" about five times, no success, once warranty expired, GM dealers 90 miles away were still willing to inspect vehicle since problems started while under full GM warranty, but now, they refuse to give me a rental and tell me they do not know what the problem is. My local GM dealer (alamogordo) refuses to inspect vehicle and thus I am required to make a 180 mile round trip, but now, even dealer tells me they do not know what the issue is and they cannot reproduce the problem in the shop. I took about 6 videos with my droid after the problem happens, because the problem lingers for about 15 minutes, then it stops and the vehicle works fine. The videos how the RPM's going up and down, up and down, until the car shuts off, I restart it, then it shuts off again, over and over again. Problems usually appear in the am, as I drive off for the first time, before it is driven a good distance, but can and has happened at any moment. Very dangerous and I do not feel safe each morning as I leave my mountain home, especially in cold snow weather.

- High Rolls , NM, USA