hi, Like I just said in another thread, I don't know specifically about new ages, but What I do know is that your car can thin that somethings wrong and then try to save its self from breaking down by reigning back, you'll just notice that it feels flat, it will go, but there wont feel like you have the torque...
Like John says, if you can see what your codes are, you'd need a garage or someone with a cable to be able to check your ECU, then reset it...
I had similar, car was sluggish, checked my codes, and it turned out the Knock sensor had showed a fault code, the engine saw this and reigned back the engine, safety mode like...may only be that simple...