Misfires are a notoriously difficult problem to detect and diagnose, which is why we created the GTC505.
The GTC505 Engine Ignition Analyzer can tell you exactly which cylinder has an ignition issue, even if the issue is infrequent. This tool is very easy-to-use, and requires no setup. The 505 will help you detect cracked COP modules, bad coils, and faulty ignition wiring.