1.d4 Nf6 2.Nf3 g6 3.Bg5 Ne4

1. d4 Nf6 2. Nf3 g6 3. Bg5 Ne4

Does anyone know any good sources or have any helpful advice for playing the black side of this line?

Its called the torre attack. Google it.

its covered extensively in the new torre attack move by move book by palliser (which i quite good).

Its going to be difficult to find sources on it as it is a sideline, here is what palliser has to say about it.

"3..Ne4!? This active leap was quite popular back in the early days of the torre being used against 2..g6, but is now rarely seen at grandmaster level. However, the move is still seen on occasion at club level, largely from two sometimes related types of player: creative folk who like to go their own way as early as possible and players with no line prepared against the torre who want to get white away from the mainlines."
Palliser, page 112 'Torre attack, move by move'.

4.Bh4 is the main move according at palliser, which i find somewhat odd considering the trompowsky advocated bf4, maybe this is because g6 has not been commited yet in the tromp, so a h6 g5 would waste time?
However palliser does list Bf4 as an alternative.

I had a flick through the chapter and it seems that this will likely lead to a somewhat passive, slow position with pieces being traded off into a dead equal position.

Some hints: After 1.d4 nf6 2.nf3 g6 3.bg5 ne4 4.Bf4 
Many white players may try nbd2, nxd2 qxd2 and attempt to exchange the fianchetto bishop via h6. However this will be like white playing the barry attack a tempo down and is nothing to worry about.

I think following ne4 with c5 is slightly annoying for the torre player.

This is because usually torre players would like to answer c5 with e3, however unlike in  1.d4 nf6 2.nf3 e6 3.bg5 c5 4.e3 Qb6, white has no good gambit from this position, so many torre players may make the mistake of playing e3 naturally in their systematic mood and reach an awkward position, so personally id probably play this line, (assuming i had to play ne4, i think the e6, c5 lines are stronger).


 

I was asking about a specific line of the torre.  I googled before posting here. May I suggest that you try and understand a post before replying to it?

Fear_Itself, thanks for the explanation.