Yeah, he left the codes part out of the first post. Then I figured knowledge on a leak down test wouldn't be a bad thing, and running it won't hurt anything either.

I thought A-6 codes still set off the light, but perhaps the bulb is burned out? He said he has codes in A-3, so perhaps he checked them all and there was nothing in A-6.

I had an issue with my wire to #3 being cracked and sparking on the block occasionally. Several weeks went by where occasionally it'd run with some hesitation at the unusual times (55mph, as I'm shifting into second while accelerating), and one rainy day i found it, watching the spark go. Not once did it set a code. I'm not real sure how it calculates misfires, but I think valve issues would show up. Air leaks tend to show up as fuel trim codes, but they can take a while to do so.

Would being off a tooth get all the cylinders or just a few?
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If you're not driving it "like its stolen," are you really driving?