Have you checked plug wire /coil routing? Also, plug wires can be broken internally (especially the rear bank) when removing them from the plugs. If you removed the plugs/wires to do the work and did not install new wires, that could be the problem.
(Image copied from "firing order?" post located using search feature at top of page - thanks, harofreak.)
This image is from an L67, but your L36 routing/coils are set up the same.