Audi 80 B4 – Error source undetectable!

Halli Hello! So that I can be helped as specifically as possible, I start from the beginning and tell the procedure: Vehicle: Audi 80 B4 1992 90PS 2.0l Petrol Engine identification letter ABT 1. Car does not start – 30.12.2009 2. Car has been standing since 23.12.2009 3. Battery charged – Car does not start 4. Bridged – Car does not start. 5. ADAC breakdown service arrived. 6. Errors are the drunk-off spark plugs – I should buy new ones so that the car starts again 7. Spark plugs changed – Car still doesn’t start. 8. Let ADAC come – Off to the workshop 9. The rotating “thing” in the distributor has been replaced – because according to the workshop this is defective. 10. 1 day goes into the country – part replaced – Car jumps on – but goes out again. 12. One step further, gasoline spray from the air filter, so the round black air filter part has been dismantled, and from the opening underneath the car sprays gasoline out. 13. The car starts and runs for a short time with 14. The workshop – Boy is sure! – The control unit is broken! – But I can’t get one, just new and that’s going to be expensive! – If you find one or I put it in, and you can go home with the car! 15. Everything clear! – I to the junkie – control unit removed from a similar model! 16. Built-in! – Same error! 17. After new spark plugs have been installed, this part under the distributor cap 18. Now you are asked, does someone have an idea for the cause of the error? – The guy also said you can change the whole carburetor unit – but the is pig expensive that is worth it I don’t think to exchange around great. Thanks for quick help!