MY `93 5.0 WILL LOSES POWER SOMETIMES WHEN IT WARMS UP. IT IS LIKE IT EVENS CHANGES THE SOUND OF THE EXHAUST NOTE. SMALL MODS, LIKE MAC 2.5 EXHAUST, MAC COLD AIR INTAKE, ALUM. DRIVE SHAFT, 3.55 GEARS,PRO 50 SHIFTER, CAM 1 5/8 HEADERS. NOTE SOMETIMES IT WILL RUN JUST FINE. HELP PLEASE!!!