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I read the entire thread that you have going already. Looks like you are spending lots of money on the car and not only getting the results you deserve... Do you think that computer tuning is the answer here?
Hopefully you will get all the issues resolved although it looks like it is going to be a handfull to get it running right.
I bet that the Heads and Cam package from MTI for $7500 with 420rwhp is looking pretty good right about now....
Did your car run fine in 110 degree weather previous to this?
By the code that is popping up it sounds like one of the knock sensors may have been hooked up wrong or is defective.. Although not good, it wouldnt cause these type of problems.
Perhaps your fuel pump is on its way out.. That will cause major detonation.. I went through this a few weeks ago.. New fuel pump and it was like a new car.. I never had the low RPM sputtering liek you describe though..