simply put, there is not enough power at idle to run things smoothly, it's a 4 banger too, what do you expect? if you want luxury then get a v6 and you will never have problems running accessories or have vibrations, in a 4 banger the angle at which the crankshaft has to turn to get another cylinder to fire is greater than a 6 or 8 or 10 or 12. divide 360 into the cylinders or whatever but basically it's slowest type of motor to fire each next cylinder, but it is more economical and efficient and thats why our beast cars get amazing mileage for the amount of power we put out.