Possible bad cat need help
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Joined: Sep 2011
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From: nj
Possible bad cat need help
Hi guys I have a rough running ls2. at cold start and idle the car runs rough and misses. The only code I have is p0300. At cold start the front o2 sensors fluctuate and the rears stay at 400mv, Is this normal or is it an indication of clogged cats? the car has spark and when I pull the injectors plugs I notice a difference in rpm on each cylinder. The injectors are firing. I feel its the cats. Plus I noticed a horrible rotten smell on start up yesterday.
