Assuming plugs are ok your problem is more than likely the coil pack unit according to the year you've suggested, it should be screwed to the top of the rocker cover or just follow the spark plug leads back to the unit. There are tests to check resistances of the unit you could ask a local garage to test it but they are relatively cheap to replace with aftermarket components.
L.J.B Auto's Wolverhampton, October 2012
