Technical Problem with fiat strada 1.6

[Tatenda]

I got fiat strada 1.6 petrol. Is putting a spark sign on desh. So when the light is on it is performing good but the moment the light goes off it is starting to loose power and cutting off by itself what can be a problem I already change petrol pump and Crack sensor. But no change.

 

[bugsymike]

I got fiat strada 1.6 petrol. Is putting a spark sign on desh. So when the light is on it is performing good but the moment the light goes off it is starting to loose power and cutting off by itself what can be a problem I already change petrol pump and Crack sensor. But no change.

Is there any chance that "spark sign " is an immobiliser warning? Although usually it would work the opposite to what you mention. Do you have a spare Chipped key?
Are there any loose wiring connections?