Hello and welcome to just answer
I believe that this car will have a ignition amplifier that controls the wiring to the coil packs. I think it should be located near or bolted to the air filter housing and the unit has two wiring plugs on it. On one side it will have 4 wires and the other side will have 5 wires and I would recommend trying a new one of these next. I will try to find a picture of one for you and post it here for you.
I hope that this helps and if I can help further please feel free to ask
Hi here is the picture of the unit that I mentioned above
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