1998 elantra transmission "grabs" when at a stop

every thing operates as normal but when i am stopped and in drive it feels like the transmission is grabbing to go. after about 10-15 seconds it stops grabbing for awhile then starts again. it never stalls but feels like it could. idle speed is good and like i said all other things are normal. question.... is there is an adjustment to any linkage to remedy this?. or any suggestion would be greatly appreciated