Chance Michael Hartje

Alright guys I don't know what's up with my car I bought it from some guy therends was. Not a problem when I bought it never touched it performance wise. 97 quattro with the 1.8t it is bi polar on what it wants to push for boost, sometimes 18 sometimes 10. I smell raw fuel from the exhaust at all times, throws a code for running too lean. Sometimes it will cut out when I Matt it. I get 179 miles on a full tank.. the wire harness looks custom because it's hacked up in some spots but it's all done correct..it has a projective tuning computer but doesn't say what,tune is in it.. almost looks like injector #1 is leaking a little.any help would be awesome thanks