Broke down and had to be towed ...

[Jason]

Last night on my way home, I am getting off the highway and noticed the tach/rpms were jumping around a bit. Thought for a second, hmmm maybe I should have that checked out. It went away as quickly as it occured - temporarily!

About 100 yards later, the rpms dropped to zero, began bucking a bit and the H2 stalled out on me. A very strange feeling, as I was doing about 50mph, yet had no power. I was able to pull safely off the road and try to start things back up. Was able to get it started but just for a second, as the rpms began jumping up and down and then I stalled out again. Tried one more time - with the same results. The only indicator on my dash which was lit was the battery light. Yet this did not seem accurate as all of the accessories were working fine (windows, radio, lights, etc.)

The good news was that OnStar was also working. They did the remote diagnostic test, that failed to report back anything. Hummer road side assistance was not an option as my local dealer's tech was off the clock!?!?!? OnStar was able to send out a flat bad tow truck to me. Obviously, it was going straight to the dealership.

My first thoughts were that someone dumped something in my gas tank (vandalism), but that does not seem possible as I have just been at my office (where my truck sits right outside my window - alone) and at my house (in the garage) for the past few days.

Anyone have similar problems? Any intelligent notes that I should pass on to my service rep?

Thanks for your help!

Jason