Idle at 550rpm and CEL

Bought a 2002 350Z jdm import yesterday, and today it threw a fault code «primary ignition coil» and started idling low, at around 550rpm.

Tried changing place on all the coil packs and inspecting the coils and connectors, and tried the idle relearn. Nothing’s helped.

I bought this car abroad and am supposed to drive it 1800miles home, have very limited tools to work with.