Cam position sensor and an o2 sensor on bnk 2 keep coming up.
As to the numbers, each machine reads completely different and I don't remember the equation to get close to true rwhp but I don't think a stock 4.4 would run higher numbers on these machines.
DUDMD is the guy to explain all the info and how it gets processed, he totally has his dyno understood and can explain pretty much everything to a guy. (minus that 4th readout down. That was a freaky thing to see when it happened) That, a stock 4.4 would destroy.
We were all wondering what happened there but 5 minutes later things got better. Not terribly better but better. Still wondering why the AFR wanders all over the place and why the advance is so off.
I have my stock 4.4 dyno in here somewhere. (this thread)