Lupo engine starts briefly and goes off again

Hello, I’m new here! I apologize if the topic has already been addressed! I’m 18 years old, I’m currently completing a training as a body builder, so little experience! of course I get support from friends! I bought 2 Lupos: Lupo 1.4 Mpi 60ps 2003 Lupo gti body 2001 now I got a half empty lupo gti body cheaply, I came up with the idea to install my engine 1.4 Mpi 60ps into the gti body has worked so far without any problems! The following problem: If I want to start the engine turns to 3000 U/m and goes out after a few seconds the Abbas smells something! Imprisonment, fuse, relay, fuel systeam, sucking everything in controlled but succeeds.. I hope you can help me!