I am having trouble figuring out what's going on with my Excursion. I was on the freeway, and I had no power. I had to push the gas pedal amost 3/4 of the way down before I got any response. The pedal felt like it wasn't doing anything. At the time the boost was at 1-3 PSI. After 3/4 throttle it took off like normal. Does anyone have any ideas?