It's normal for all 4-bangers to be a 'little' rough, but standard upkeep will make the best of it.
Be sure the engine mounts are good, they can make vibration worse.
Make sure the timing belt is good and if you replace it get the idlers too.
New plugs and wires. OEM style double plats and OEM wires.
New PCV valve and the rubber part of the hose to it.
Clean the MAF.
Remember, it has a check engine light and you can check the codes yourself if it comes on.