Question about 2006 Chevrolet Cobalt

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I have a 2006 Chevy Cobalt and I have read several posts that sound like the problem I am having. My car runs fine then the engine will start surging--the RPM guage will swing wildly from 500-2000 while driving. This started this past winter and seemed to occur when the temperature was below freezing. When we would stop, the car would die but would restart instantly. It would just stop acting up after about 10-15 minutes. Now, the weather is hot, and the engine surges at times, especially when the AC is on high--I turn the blower down and that seems to ease up on the problem but doesn't totally stop it. But if I am driving slow-less than 30--the car will just suddenly die for no reason and without any warning. Also, the AC will blow cold then will blow warmer air. My husband has a code scanner and it didn't show anything.

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I have an 06 cobalt with the same issue and when my engine light finally came on it showed up as evap system malfunctioning. This is for the emissions system. My code shown was P0440. This can be caused by a faulty or loose gas cap, a purge valve, a vent valve, or the evap canister. I am waiting on the purge valve to arrive now so should know if that takes car of mine in a week, but i have already replaced my gas cap and the problem is still there. Hope this helps you some

Posted on Sep 13, 2010

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