ALL I REMEMBER: A couple go to the forest in a Jeep. Things get weird and spooky. I think the forest itself becomes possessed. They try to leave in Jeep but the forest kills them? Can't really remember. I think the guy dies first, and then the woman tries to escape in the Jeep; I remember green slime and/or red stuff smeared across the front wind shield, and the woman screams because the forest is trying to kill her and she can't see...
Anything would help.
Could this be a partial memory of either "Evil Dead" or "Evil Dead 2?" The second is pretty much a remake of the original. The spirits that lived in the forest tended to make motorcycle sounds and zip along the ground as they chased the people.
A woman in the story has a close, personal encounter with a possessed tree.