I know are cars suffer from rough idle when the motor is cold, and I guess its something that we have to live with... well yesterday i reset my ecu, I warmed up my car (didnt drive it) for about 15 mins, shut it off and reset the ecu. This morning when i started my car it was seriously perfect. Its probably not a permanent fix, but it worked.. someone else want to give this a try?

 

It depends on the temp outside. The low emissions stuff on the car will cause it to run a bit more rough at start up so the engine gets up to operating tempature faster. There is nothing wrong with the car, it's done by design.

 

Seafoam can fix some rough idling..I dont know if that will work but u can give it a try. Good luck

 

My 06 TL with 36000 miles is rough when it first starts up in the morning.

 

as others have said, the car will misfire slightly and dump a little bit of fuel to get the catalysts to warm up faster

 

I didnt buy my car new, but did people notice there brand new cars doing this?

 

Yes even the new ones were a bit rough at start up.

 

* you could do a plug change, but obviously, your car's too new for that. honestly, my car has 92.3k on it and after doing the plugs a few weeks bag; she idles quietly and without any "roughness"

 

move to a warmer climate....