Random mis after cat replacement - Pontiac G6 Forum
 
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post #1 of 1 (permalink) Old 07-22-2018, 04:24 PM Thread Starter
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Random mis after cat replacement

So I have a 07 g6 gt 3.5. I replaced the cats with walker cats due to the cats being bad. After I started the car and it was struggling to run and missing really bad. It threw a p300 code. It will start then the rpm goes up and down and it dies. My friend I hooked the battery like a idiot and now it won’t throw the code again but is doing the same thing. Can’t figure it out any ideas?
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