Engine Start issue

Asked by Sep 15, 2015 at 06:55 PM about the 2008 Hummer H3 Luxury

Question type: Maintenance & Repair

When I start the truck, the RPM's REV way up, then come way down.  The
truck then rumbles/shakes and white smoke comes from the exhaust.  
Doesn't happen all the time, but often. What is going on?!

1 Answer

16,850

Clean throttle body and Idle Air Control valve (IAC) and check air filter.

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