After installing an MSD coil kit only 2 cylinders fire. How do I check the coil?

Measure the coil with an ohmmeter: primary resistance between the pins (typically around 0.5–0.6 Ω per coil) and secondary resistance between the paired outputs (e.g. 1–4 and 2–3, typically in the kΩ range). If the values are normal, check the wires, plugs and connector before blaming the coil. A bad spark plug wire can damage a coil. If the coil is confirmed faulty under warranty, we replace it using our photo-and-destroy procedure (mark with a code, photo, destroy, photo).