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2005 colbalt 2.2 One day car just started running really bad. Then it wouldn't start. Had a tune up done, and replaced fuel pump. Now car is still running badly and the exhaust pipe around the cat is red hot. Also throwing a p300 code. Appears cylinder 2 is not firing, would this cause the hot exhaust pipe?
 

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Unburned fuel igniting in the CAT is never a good thing. You aren't getting spark. Checking the plug would be the first logical step.
Think about it. Something has to ignite the fuel :)

I agree with banker
 

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P0300 is multiple misfire, but like the other guys are saying your cat is plugged. You will need a new one.
 

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Getting all the built up pressure...from the bad converter...causing the misfire.

Clogged cats happen.

I hate GM converters...get a universal Magnaflow one off of EBay...should be less than a hundred bucks for one and have a shop weld it in. Shop shouldn't charge more than $20~ to do that.
 

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Shop will prob charge an hour to do it unless your cat is under the car and not behind the motor like mine
 

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Levee
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bad cat, that will skew the fuel trims enough to cause misfires.
 
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