Yep, I throttled thru mine a couple of times before it died completely. Was POSITIVE I had a fuel problem...nope ICM was burnt all to hell looking, popped new one on and never looked back.

Quick update. It was the ICM. Changed it out and all is well in 502 land!

Just got back from stealing one last boating trip from winter! Made a run from Parker to Needles at a fairly good clip, not one hiccup or stumble.

Some search terms for someone else dealing with this...

(Ignition control module, stumble, backfire, miss)