in my automatic honda civic si(canada)..whenever it shifts gears, the car jerks just alittle bit sometimes..the same thing happens when it downshift as well. i did a tune-up today(spark plugs, distributor cap & rotor, fuel filter) but i'm just guessing it might be:
spark plugs wires? fuel injection system? vacuum hose leak? or just needs a tranmission oil change? timing? any ideas?