Question about 2007 Saturn ION-2 Quad Coupe

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Check engine light on,engine surges while stopped at light

My 2007 ion has 45,000 miles on it. Lately it seems like the engine is surging up and down when I'm stopped at a light. It also randomly shifts really hard (kind of clunks) when coming out of 1st gear (automatic) but shifts OK after that. Check engine light came on and coded out that number 3 cylinder recorded a misfire. Spark plugs have been replaced. It doesn't feel like the engine is miss firing. It drives fine once you get going.

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  • Anonymous Mar 17, 2014

    No check engine light is on. Dash is not working right. Revs really high before shifting if at all.

  • Anonymous Mar 29, 2014

    this causes my car not to shift properly.

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  • 25 Answers

Could be a vacuum leak. When rpms are up, it has enough vac to operate properly. Check all vacuum hoses and make sure they are all on, and look for splits or cracks in the hoses

Posted on Dec 03, 2008

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While driving my jeep seems to be shifting gears the rpms rev up and then goes back down almost as if surging I changed speed sensor as a guess so far but did not work?


old 1995
we need vastly more symptoms then that,sorry
if the engine surges, that is first. (surges in 1 gear)
but if a transmission down shifts that is normal, rpm rises
(after all its a lower gear) (higher numeric ratio)
find any machanic in town
ask him test drive it.!
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seems you can not, and learning is 1hour in car class..or 10x that lacking facts of drive train functions.


stop guessing. why spend cash on a useless sensor now.
spend cash on $1 shop diagnosis and WIN.
i promise !

or get it scanned.
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