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Okay, saw this movie in the mid 90s, it probably is from the 80s and was about a guy and a girl (maybe another couple too...) driving in a hilly and pretty barren kind of place (in a jeep I believe) when they come across an old stone house's remains. The walls are only standing but when they step in the house seems back together.
So they try to leave when a fog comes and envelopes them and when it clears they are back at the house.
They are attacked by demons reminiscent of the Evil Dead and at least one makes it out and heads for a truck diner where a waitress end up being a demon too.
Help me dudes I've been after this flick for 10 years.