Car shakes a little upon starting?

Hello I have a 1998 Dodge Stratus. Sometimes when I start my car it shakes a little and then stops as soon as I start driving. It doesn’t do it all the time and it hasn’t done it in months. I did not drive yesterday and started it up today if that could be a factor. It did it this morning on a cold start (in warm weather) and I am a little concerned. Should I be? It had a tune up last November and it really hasn’t done it too much since. When I turn off the car however for as long as I know it shakes a tad and makes a weird noise from the engine like a “clank” Could these be connected? If not is it normal for it to shake after not using it yesterday?