On the way in to work this AM at a stop light I noticed low RPM and an unusually rough idle. Put it in neutral to goose the gas a bit and back to drive to pull away, once up to speed things were fine. This repeated itself at the next couple stop lights and then the "limited performance" engine light came on. I was able to get it into the parking garage, pop the hood, nothing smelled odd.

Any ideas on this one or should I just call the dealer and take it in?

 

Can be many things including failing or failed coil unit(s), fuel supply problem or vacuum leak(s).

Is the MIL on and if so, what are the codes stored?

 

You could have a blown cat or one of the air breather filter sensors could be gone, any codes.

 

You can get the codes read for free at Advance Auto or Autozone, then post the code numbers here.

 

It's at dealer - with error code saying multiple misfires on bank one, the complete passenger side of the engine. They're enlisting more support to narrow down the problem. Very thankful for that CPO extended bumper to bumper right now!!

 

Byte Me (and thank you for giving me the opportunity to start a correspondence with "Byte Me)...
I've got a 2010 XKR with similar, though not identical, symptoms, including the Reduced Performance warning.
How did your situation resolve? What was the issue?
Thanks in advance...

 

Im interested in hearing what the issue was as well. Thanks