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Q: Check engine light on 1995 Chevrolet Lumina APV

Good Morning,
My check engine light has been coming on for about 6 months now but she has been running great. It comes on after about 5-10 min. of driving her no matter what the weather is.
Having said this she has the 3.8L in her about two week ago I noticed a what feels like a miss at about 40 mph she has a miss but when I step on it she has great power no hesitation.
Today when I was stoped at a light I noticed what seemed to be a miss. As I said this light has been coming on for a good 6 months or longer with no problem.
Anyway what I would like to know is what sensors set off the check engine light?.
I know I should bring her to a garage but being out of work I was wondering if someone could just tell me what I might check?.
I collect old cars (Chevy's) no computers so I would know where to lok
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