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Kevin Bourcier
Kevin Bourcier,
Category: GM
Satisfied Customers: 117
Experience:  Owner/Technician at Max Air Mobile
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2007 Hummer H3. At times the engine will have a misfire

Customer Question

2007 Hummer H3. At times the engine will have a misfire especially under a load. I changed the spark plugs with A/C Delco plugs and put a new coil on that cylinder. Still has a misfire on #3 at times not all the time.
Submitted: 10 months ago.
Category: GM
Expert:  Kevin Bourcier replied 10 months ago.

hello . You should check your catalytic converter for being plugged . That is a common cause of misfires .

Customer: replied 9 months ago.
intake was leaking
Expert:  Kevin Bourcier replied 9 months ago.

Okay . That is great that you found your problem . Thank You for using Just Answer . :-)