I am wondering if the O2 sensor is fouled. I do not know how much bearing this sensor has on how a SVO runs, but the symptoms that my car is exhibiting are very similar to what I have been reading happens with a bad O2 sensor. It also seems odd that once the fuel goes into open loop above 3100 rpm it stops having problems. It could be something else, but I should be able to disconnect the O2, put it into open loop and see a change pretty quickly if that is the issue...I think.
That being said, I am going to pull the codes (assuming that the computer has some) and see if the computer has any knowledge of what is going wrong with it. I dont have high hopes for this working out well since so many things are bypassed/disconnected/etc that it is likely to be a breakfast hash of code goodness, but it is worth a shot.