I had misfire in all cylinders - I changed all the spark plus + two coils ( all Volvo parts), during test drive car ran great. There were some naked wires in cylinder 4 and 5 coil - I tried to cover with heat resistant and electric tape . Suddenly car does crank and not start (seems wire touched each other). I again separated all the cylinder 4 and 5 coil wires re-taped..... Car does not start. Any advise what to do

 

naked wires as in exposed copper or that the sleeves have crumbled and you can see the wiring? Do you sense any spark? try inspecting the connectors between the wires and the coils for any cracks. If you shorted you may have blown a fuse so inspect that as well.