So my mechanic and I have been researching the last month on what could be wrong it my Jeep. It is the 2.5 4 cylinder with 130,000 miles on it. So it has a very loud knocking in the bottom of the motor but only when the motor is warm and you give it gas gradually. It still knocks when the motor is first started but it isn't no where as bad. Another problem it is having is the oil pressure drops to 0 when I'm coasting in Neutral and at the same time the jeep has been cutting off while coasting. So here is what has been replaced: Fuses in the main fuse box, Oil Pressure Sensor, Oil Pressure switch, and all the 02 Sensors. So could this be a bad Oil Pump or something much worse?