do you know that every coil pack is firing strongly.
i would test each coil pack individually you will have to have spares to run the car on then on one of the front coil pack swap ech coil you want to test on the same coil pack position.
to test it:-
plug coil pack in to the loom and use a grounded wire to allow the coil pack to spark to and draw the spark from the end of the coil pack and see how far the spark will jump to the grounded wire. it should jump about 1 inch from the end of the conductor on the inside of the coil pack from the spring contact.
each coil pack should sparks should jump the same distance. you can buy little tool for doing this with an HT cable and an earth clamp and a screw that you screw in and out to adjust the the spark gap jump distance.
but a earthed wire or test lead will do the same job.