I drove it back up to the dealer yesterday morning. It is about a 50 mile drive. I let the engine warm up for about 30 minutes before I left. Everything was great for about the first 15 miles of the trip. Lots of power, no stalling. Even got up to 67mph at one point!!! Then it began to trail off, first you are lucky to get it to 55mph, then to 50mph and by the time I got to the dealer it was topping out at just under 45mph @ about 1600rpm's. It stalled twice on the way there. It stalls whenever you let off the accelerator.
Before I left, I checked to make sure none of the intake hoses were collapsed or anything obvious........