Skipping Hummer h2

[HUMTECH]

If you have an intake(vacuum) leak it will almost always set a lean mixture code and will turn on the ses light. Need a scan tool to force it into closed loop operation and monitor fuel trim levels while spraying air intake cleaner around the intake gaskets with the engine cold, if the fuel trim levels change dramatically the intake is leaking. Dont think this is your issue though. I will put some thought into it and see what i can find.