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Is your CEL on? Mine just started running like crap the other day. Rough idle and backfiring. Took it in and they said the catalytic converter is plugged up. I've got a new one ordered so hopefully that cures it.

Have them check to see if the manifold is cracked. That somimes plugs the cat


2000 Cobalt Blue Sportage EX 5 speed Leather and ABS? 225 tires