Looking for assistance... 01 GT runs fine when cold, stalls when warm. Holding the RPM's up, it runs rough, missing and sputtering. Returning to idle, may as well turn off the key. No codes. Trying to start when warm it fires and dies. checked fuel pressure and it's right, 55 PSI cranking, 50 PSI KOEO and 45 PSI running (cold). This really acts like a fuel pump but with the pressures being what they are?? I'm open to all opinions. Thanks in advance