Mornings are cooler now in connecticut. I mention that at cold start my Prius C idles pretty rough. Does anyone else has the same issue? BTW, I just did my 10K miles service today. And it is second oil change I made.
The only time I experience what I would call a rough idle is when it chill *and* I have let the battery get too low. Your temperatures are probably much lower than mine, so that could be the cause.
The only time I have experienced rough idle in the morning is if I have moved the car from the driveway to the garage the night before and did not let the initial warm up cycle complete..I have verified this a few times...now I just put it in EV mode when moving around the driveway. Hope that helps.. -M
