Man, black keeps taking and white keeps giving. Not a bad gambit although black should have transposed to a French with a pawn more 4...e6 and white does not have a lot of compensation.
If you want to gambit in the Scandinavian Defence, try the Blackmar Diemer Gambit.
1.e4 d5 2.d4?!
Here is another crazy gambit line that I came up with. Black has a few tempo checks, but if he doesn't see them, he is in trouble.