Re: my rpm fluctuates during idle (especially when engine not warmed up yet)
I had the same problem with my '04 after it got about 30,000 miles on it. It was a rough surging idle when cold, that got better but was still rough warm. The dealer suggested a can of injector cleaner and switching to premium gas. It worked and saved me from one of those expensive injector cleanings.
I was so thankful for the honesty of the service department that they got my business when I bought my '06 H2. Give it 300 miles and use a can of the injector cleaner on consecutive fill ups.
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Hummer, like nothing else
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