My 2009 Honda Civic lx 2 door coupe is shaking in the cabin when i start the car. It also shakes in park and reverse. Please help!!!

check for broken motor mounts and try this cleaning https://www.youtube.com/watch?v=NWCKvU2FmDc

scan for codes and yes clean throttle body is a great start

motor mounts...strut mounts if it has dogbones the rubbers go bad...true