vauxhall corsa b cutting out
i have a vauxhall cora b 1993.used to have a 1.2 ls engine in now it has got a 1.6 gsi 16v in.got the car as a porject,wasunt running.got it runing in the end,then out of the blue my car decided to play ticks on me by starting then cutting out a few seconds later.i didunt worry about it two much as i was chageing it.now i have changed it to the one said at the top but it still start then cuts out.i have tried all sorts,so far i have changed the fuel pump,fuel relay,fuel filer,put a live from pump to iginition,fully rewired to car with a 1.6 gsi loom,checked and double checked i have got every thing connected,alo i have had 2 mechanics out,and one car sparkie,2 of them had diagsnotic machines worth �4:500 pound.but couldunt get them to read it.no one seems to have had this problem what i am haveing,please someone help me its driving my round the bend lol.thanks