1993 Mercury Villager Engine feels like it is rocking back

Engine Mechanical problem
1993 Mercury Villager Automatic

I have not had alot of problems with this van with the expection of 2 things.

1. When you first you start up the van you get a very high pitched squal noise, but after a little bit it goes away. More common in the colder weather.

2. Friday night we drove on a dirt road, parked at the business after dinner (2hours) came out and went to start it and the whole van was shaking. After alittle bit it got better, but yet not 100%.

Saturday it would shake when the van was started and when it was first put in to R or in to drive, but once you were driving it was fine, but as soon as you stop it would shake.

I had my husband put the van in to drive while foot on break and I opened the hood and the whole engine is rocking back and forth.

Could this be a broken mount or something else. Any info would help.