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Hi I have a 2004 chevrolet classic automatic. When I slow down at a stop light my car acts like it is going to shut off on me. I notice a humming sound right before it starts trying to shut off. And when I take off I here a clunk sound. It does not happen every time I am driving but it been happening more often lately. Could someone help me out?

Answers from the Automotive Experts

Amanda J. Pierce, MBA Brandy, I recommend that you have a mechanic perform an inspection. You could have a number of issues that can cause this drivability concern. Some items may be such as; IAC ( Idle Air Control Valve), Alternator windings failing, Mass Air Flow Sensor....The list can go on with possibilities. I recommend visiting a reputable mechanic. Hope this helps! A. J. Valle

Kerri Papajohn, Marketing Director at USA Sealants, Inc. Hi, the humming noise could be associated with extreme heat (engine blowing out). More importantly, I would have a mechanic look at the sensors and valves related to the vehicle's Idle Air Control. The referenced "clunk" sound could be a transmission mount. If you are hearing it while you turn the wheel as well it could be a control arm though it is most likely just the former.

Judy Curry, Co-Founder and Vice President of Marketing at Currys Auto Service Brandy, This may be a transmission issue. I would try to get your trusted technician to try to duplicate the scenario so they can get a good idea of everything that is happening. Make sure they test drive it and not just make a guess based on what you have experienced! Judy

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