Hello. I have a 2000 dodge ram 1500 with a 5.9 auto. I am having trouble with a interment loss of power like I'm running out of gas and back fire, At the same time I hear a loud vacume and blue smoke from the tail pipe. I have tested the fuel pump and changed the cap, rotor, wires, crank sensor and TPS Sensor with no luck. There is no codes or eng light on. Looking for ideas thanks