Turns out that the new PCM had a bug in it too. The 0420 code came back up. So I call the guys at Intense and found out it was an oversight that 6 of the 7 rear o2 codes had been deleted. They said to go ahead and sent that one back in. Something I later found out is that during that phone call, they had already boxed one up and was in the process of sending me a new one. Really great customer service!! I did go ahead and put my OEM, unmodified PCM back in for the mean time. Now the transmission seems to be having some issues finding the proper gear when slowing to around 5-15 mph and accelerating back up to about 35-40 mph. Seems to be hanging on to 1st gear for a long time. Guess this might be becasue of swapping PCMs so much.