jigling doors

I have a 1988 suburban 4wd and im trying to figure out what i need to fix to get the doors from jiggling all the time when i go down the road. Its only the front two doors and the rear doors the barn doors. If anyone can tell me please do.

I too, had that problem in my 1989 GMC 4WD "Bus". I found that the plastic bushings formed around the door strike had cracked and broken away. You can replace the whole strike at about $15/door. You can order these from LMC Trucks; I don't know if they are still available from the dealer or not. A large Torx driver will also be needed.