I have a 2011 Honda Civic and since it has been cold (winter in New England, US), from a cold start, idling or moving in reverse, the car vibrates but does not do it in park nor drive. At first I did not notice that the car did not do it some of the time - for example when it is warmed up after a drive and cannot fully cool by the time I finish in a store or something. Searching online yielded the following: loose engine mounts or snow in the front wheel wells, but neither seem to be the issue.
What might be the problem?
Thank you in advance.