How can I to hold on to the pawn plus for black in the Queen's Gambit Accepted? A few years back I used to play with a player who always accepted the queens gambit pawn and used to hold on to it and sometimes win with the pawn plus.
Is there any specific variation that can be studied in favour of black in queen's gambit accepted?
Black can sometimes hold on to the Pawn if that is the goal.  Black has to play an early a6 and b5.  One possible variation is:

[FEN ""]
1. d4 d5 2. c4 dxc4 3. Nf3 a6 4. e3 b5


Although Black will hold on to the extra C-Pawn, White can counterattack with a4, b3, and Nc3.  Black has neglected development, and according to MegaBase 2012, White scores 60.6% from the diagrammed position with the move 5. a4.