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if it was stick i was gonna tell you possible misshift, causing pushrods to bend, if one or 2 bend enough will still run good but show a misfire code. (sometimes get a small window of hesitation in the upper r's.
1. if wires are original, spray water via a spray bottle on them, n powerbrake it to see if you can feel the misfire.
if wires are bad the water will make mis worse.
2. coils not common to go bad, and if they do would be a dead mis.
3. common with a cam change, if not tuned properly can show a misfire, clear the codes, restart engine and let idle for 5 min. turn key off and repeat process 3 times.
if code is back on the next restart, then clear codes and do the same process except @ 1500 rpms for 4-5 minutes turning key off and doing this 3 more times.
if code is not back. then i would have to say that it is the cam throwing a random misfire code @ idle. (which is known to do, thats why when they are tuned the misfire set light is inactivated/deleted.
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