Sonic (Aveo) The subcompact known globally as the Aveo since 2002 is now the SONIC in North America as of the 2012 model

Chevrolet Sonic
GM Platform: T200, T250, T300

Rough and shuttering out of nowhere...

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Old September 17th, 2010, 6:32 PM
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Default Rough and shuttering out of nowhere...

04 aveo

hey guys im new here help me out if ya can, thanks!

Over night the car started running like crap. Timing belt blew 5k ago and had it rebuilt. Great compression great fuel pressure. tried sea foam with no results. spark plugs are good

Runs rough, very poor acceleration. idle is all over the place. Check engine only came on after i tried to drive it. Pinging and knocking if i do drive it, almost sounds to be Hissing.

any ideas? thanks for your time!

-bbc
Old November 15th, 2011, 11:54 AM
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The hissing sounds like a vacuum leak check all your lines first that would also cause the idle to jump
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