Dude-That was GM's "Displacement on Demand" option for the H2. The intake manifold shuts off cylinders as per the needed amount of horsepower.You just needed to give it a kick on the loud pedal and the problem would have fixed itself. 
Guess thats 1 less HUMMER for me to see in Tomball... 
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Had-94,96,98,99 Cobra Stang,99 Navigator,03 Expy, 05 H2
Have-08 Titan C/C,06 GCSRT-425FTLB & AWD, other junk..
Want-08 Viper, 06 M5 
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