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In all of my toyotas before it seems like on a cold start the engine sounds rough for about 15 to 30 seconds, after that the RPMs settle down and the engine starts to slowly drop more RPM until the motor warms up more and gets down to that 600-500 RPM idle. I have also noticed that with the FR-S and all of my toyotas prior that if you try to drive the car normally after a cold start it will feel like the drive train is being held back. in the FR-S I will start it up and wait for the coolant gauge to be at 1/4 (after the "C"marker) which usually takes about 3 to 5 minutes depending on outside temp. then I will pull out of the drive way and drive VERY slowly keeping RPM under 2k until the motor coolant gauge is at its normal spot ( I think 180 or 190 degrees when the thermostat opens up). My dad has owned toyotas his entire life and has passed this habit down to me, neither of us has had a engine fail but I don't really want to change my habit to find out if it will fail or not lol
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