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the engine says h23a3, but I thought they were supposed to have a blue top? I've never seen this color. is it the same as the h23a1?

I got a 94 prelude with an H23a3 non vtec engine from a brother in law. when I first got it, it struggled to start, but would eventually. now it wont at all. I checked for a spark and got nothing, so I took out the distributor and found that it was in pretty bad shape and I need to either clean...