PLEASE HELP!!! Trouble Codes for an 1988 Audi 90

[Hugh Farfan <dpch@tbol.net>]

My car has been driving fine up till  now.  As I pulled into my parking
lot the car began to lose a little power on acceleration.  After I
parked the car and turned it off I decided to restart it and drive it
again to see if the loss of power was still there, it wasn't as
noticeable.  So I just parked it and left it there for about 3 weeks,
(went on vacation).  When I try to start it, it won't start, the engine
just turns but it wont catch, the battery is fully charged, I tried to
start it a numerous amount of times but she wouldn't start.
I am in New York, so I was wondering if the frigid weather could be
playing a part in this saga.
    I thought I might try to pull any codes from the system, but I am
not sure on the exact procedure or the codes themselves.  Yes I know I
should buy a Bentley manual, but I haven't had the time nor money.  (I
am in college now.)  I hope that this is an easy fix.  Any advise would
be greatly appreciated. Please Help, thanks in advanced.