engine quits after 15 to 20 seconds

[uisetanta]

Hi , I thought I was having electrical problems with my daewoo 1.4 lanos. 2000.
I felt it loos power and had to rev to keep the engine idling. This was intermittent.
I changed the spark plugs and the HT leads and coil
Each of these solutions solved the problem for a short period and it returned again.
After the coil change it was going great for a few days then I drove 500 km and lay up for a day.
Now the engine starts but cuts out again after about 15 seconds.
Fuel system seems fine each injector pumps out petrol and all sparks fire.
I have been told it might be the ecu is shutting down the engine because the cam is causing problems.
I removed all fuses and build up again one by one with no result.
can anyone help????