ok.....
loaded a locked open loop tune yesterday. I got in the car and initially didn't think it helped worth a darn, but as the rpms hit 2000 it felt like it cleared it's throat. (which reminded me of your situation hotmustang) I only drove the car for about 3 miles, if I kept it above 2k I was ok. If anything these were the exact opposite results I would have expected. If anything I could see it driving better in low RPM's vs High?!?
I guess at this point in time the bottom line is I have no choice but to believe the tune, or more than likely some sort of sensor in the closed loop system is malfunctioning. I didn't want to, but a trip to the dyno seems inevitable at this point in time. If I do have a malfunctioning sensor, the shop will be able to see where it's at with minimal time (hopefully)...whereas I don't think I'd have a shot in the dark. I see no other choice if I want to get the car running properly. I'm slightly worried about the Highway trip though.
What are your guys thoughts about limping down the highway?