In 4th gear when I'm going 50km/hr (35/mph) at like 1.75 RPM every now and again there will be a small shudder. It seems like the colder it is, the more ofter it occurs, this morning it was -25 celcius and it was even occurring while the car was warming up. In the last month I've had a tune up, with a fuel filter change done. This was happening before the tune up. Any help is appreciated!
