Hi everyone. My 02 Explorer 4.0 has a hard shudder that occurs between 1,500-2,000 RPM. It occurs when I am in light throttle and when it occurs I have to give it more throttle to kind of "push it past it" I should say. The issue is more likely to happen when going uphill or when having the throttle at a steady speed. As this begins to happen you can hear a weird distinct noise that continues throughout the shudder. There is a link so you can see it for yourself(I suck as describing issues). Other than that it drives very well and shifts smooth as far as I can tell. I have done some research and these are some solutions I have found. New Spark Plugs and Wires(Done Already) Fuel Filter? Fuel Pump Relay? Fuel Pressure Regulator Leaking into vacuum hose? Dirty MAF Sensor? Viscosity of transmission fluid?(I read about changing the fluid and cleaning the pan, also I read about adding this Friction Modifier to my fluid?) Problem with the torque converter? I want to throw fixes at this issue and waste my money so that is why I am here asking for your input. What do you guys think?