1985 Quattro 4000s - I need Help!

[skoczulj]

I just bought an 1985 4000s Quattro.  It has been sitting for a few months,
has only 90,000 miles.	It won't start but is otherwise perfect. 

It cranks fine, but won't catch.  Once in a while it will sputter for 15
seconds or so, but just dies when you give it more gas.  If you spray
starting fluid in while cranking it will run fine until the starting fluid
is stopped.

Where do I start?  I am good mechanically but have never owned an Audi
before.  How hard are the injectors to replace? check valve? vaccum lines? 


Please help.  Thank you in advance.

Jason