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I though it's been a long time since I lived in Cali that you could go to somewhere and if it was over 500$ to fix you got a waiver. It could be a bad head gasket are you using any coolant? If so then it's going somewhere. Cats usually get to plugged and melt. They clog. See if you get good pulses of exhaust out the back. Check you vacccum you might have a tired motor. So happy no smog check in my county. If you have black smoke out the tail pipe it's not lean its rich. In complete combustion.
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