Larry's Bidding

Hand #1130

You are South. 

North deals. NS vul, IMPs. 

 AK  
 10864  
 K94  
 AJ73
 

What is your call on the auction below: 

West	North	East	South
	1	Pass	1
Pass	2	Pass	2*
Pass	3	Pass	?

*Fourth Suit Forcing