Did the check engine light come on?
Is the car shaking or is it more of a sputter?
Infiniti's are very touchy when it comes to spark plugs. If you buy cheap plugs, it will cause a misfire. The OEM plugs are platinum tipped. I know for a fact Champion plugs will cause misfires. They are cheap plugs and do not work well in the infiniti i30. I would use Bosch platinum plugs. Check the plugs and see what brand they are. If you just had them changed and this wasnt happening before, my guess is its the plugs.
If it is not the plugs, it could be a number of other things such as the air flow sensor. This often times when they go bad will cause the car to die, either when driving or stopped.
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Saturday, July 10th, 2010 AT 4:16 PM