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My blazer runs good for a bit but then its like the engine revs up and down slightly and seems like its going to cut off and it does some time. I checked the codes and it says egr and o2 is rich. I have replaced the spider injector so that should be ok. The ? is? Could she be running ruff till the egr messes up and gets stuck open and is that why the o2 says it rich and makes it run funny? If i replace the egr would it stop the o2 from saying its rich also?