[A26B]

Although the LT5 is a paired cylinder/waste spark ignition, bad spark on a single cylinder can and has occurred on more than one instance, and resolved by a coil replacement. That being said, the problem is probably related to a coil terminal, bad coil internal connection to the terminal or corrosion since a winding breakdown would affect both cylinders.

I have not experienced the "dry plug wire boot misfire to ground" that Marc Haibeck has diagnosed and resolved. Several others here on the forum have had the problem and fixed it using Marc's recommendation, liberal application of silicone di-electric grease in the boot.

In that same vein of thought, I heartily recommend and use silicone dielectric grease on all electrical terminals and the weather seals in the connectors whenever the opportunity presents.

So, as previously stated; (1) check the spark to ground. orange = weak, blue with 3/4" gap jump = good coil & wire, (2) good spark & good plug with misfire may = need to grease the plug boot (3) if still missing after (1) & (2) check ok, replace the coil. I always save the most difficult and costly possibility until last.