The car is a late '70s/early '80s Chevy Malibu (it's difficult to tell the year with the grille missing and the other damage). I can't think which episode it's from, but I'll let you know if I remember.
The car in question is a 1979 Chevy Malibu, I deduced it by the placement of the headlights because the headlights are not part if the grille itself as evidenced by the line of body paint separating the headlight from the center grille as seen here:
Rare and Behind the Scenes Pictures of the Dukes of Hazzard
in Dukes of Hazzard General Discussion
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The car in question is a 1979 Chevy Malibu, I deduced it by the placement of the headlights because the headlights are not part if the grille itself as evidenced by the line of body paint separating the headlight from the center grille as seen here: