I'm having trouble with power loss in an 02 Dodge ram 1500, 4.7L. It has 85,000 miles and little/big things starting to happen. Acceleration is weak and used to have some spunk and even pull hills at 75 with some guts left and now pedal to floor maybe hits 70. Checked tranny, the cat, new fuel pump, even put different exhaust. Anyone have any ideas? Help!