Hello Carlos. I had similar problem when I bought my 75 Turbo America. The problem was in a bad contact in the black connector in the distributor body. When the connection is no good, there isn´t spark. Please, check it.
Greetings.
Julian
1987 Alfa 75 1.8 Turbo Evoluzione
1988 Alfa 75 1.8 Turbo America
Greetings.
Julian
1987 Alfa 75 1.8 Turbo Evoluzione
1988 Alfa 75 1.8 Turbo America