Good morning all. This is my first post, so thank you for providing this forum for all its wealth of information. I have a 2000 GTP. Under 1/2 and 3/4 throttle the car has no problems. Under WOT the car has no power and seems to miss. I immediately figured it was a fuel supply problem and changed the fuel filter. No help. I checked fuel pressure at the rail and it was within specs. The one interesting thing it did do though, was it wouldn't hold pressure after the key was turned off. I immediately figured it was an injector. The problem with that is there are no idle issues and it does not blow any smoke upon start-up. New plugs and wires, new air filter and no codes are being thrown. I know this car has a 2 speed fuel pump but I'm not sure how to test if that is working correctly. Could a bad fuel regulator cause this problem? As you all know parts are pretty expensive so I am hoping someone can steer me in the right direction before I just start replacing stuff. Let me know if there is any other information I can give to help you aid me with this problem. Any help you can send my way will be much appreciated.