How JustAnswer Works:
  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.
Ask Kevin Bourcier Your Own Question
Kevin Bourcier
Kevin Bourcier,
Category: GM
Satisfied Customers: 117
Experience:  Owner/Technician at Max Air Mobile
83572702
Type Your GM Question Here...
Kevin Bourcier is online now
A new question is answered every 9 seconds

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 . :-)