Also when the door flies open the latch mechanism will usually be in the first catch position. Make sure it is fully open before you slam it shut again. First I would remove and clean all the parts and apply a good lubricant in all the moving parts. If your strikers are worn out, replace them.

1953 Chevrolet 3600
Fried Green T'mater (Vern)
In the Stovebolt Gallery
Caution: Political Statement
Man who runs in front of car gets tired, man who runs behind car gets exhausted.