Is the throttle problem of 20 10 Focus very serious and common?

Sold millions a year. How many complaints are there? In proportion, it is very small. I bought 1.8at for more than a year, and there has been no throttle problem. Fox throttle is really easy to get dirty because the engine is upside down. My driving habit is more than 2500 rpm. Let him shift gears by releasing the accelerator pedal. Keep pulling for 3000 revolutions, so that the throttle is not easy to get dirty. Personal point of view. .