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'05 2.5i H4 4-Speed Auto w/Sportshift
505 Posts
Our OBW was doing that, just before the warranty was expired. My wife took it into another dealer and they diagnosed that the catalytic converters were plugged, and ended up replacing two CT Converters and two O2 sensors on warranty. The car also dropped from 27 MPG average to about 23 MPG and the thing nearly stalled each time it was idling.

If you are still on warranty, I would get the dealer to document the problem and maybe even fix it!

It apparently has to do with the cheap ethanol junk they put in the fuel to water it down.
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