I bought my 06 Beca with 118k on it 2&1/2 weeks ago and no problems until today (I did change out the "nonexistent low beams" yesterday). After returning from running a quick errand I stopped to grab my mail. When I restarted the car it shook once, I thought my 10 yr old had jumped into the back seat, so not a subtle shake. Put car in reverse and it repeatedly shook, then I put car in drive (5-10mph) to put it in carport approx. 400ft away. The entire car shakes but not harshly and it seemed to lose power, subtle slow down speed up (didn't look at rpm gauge but I did shut off radio and rolled window down to listen and slight change in engine rev sound). Took foot off gas and coasted to spot, put it in park and turned it off. There was no change in radio, lights, or A/C. Also, engine light did NOT come on. What could it be? Thanks for your help and sorry if unneeded TMI.