hooty19

Hey, so I have a 2012 fx4 ecoboost and have had this problem start a few days ago. While driving my rpm's have started to flutter and I'm getting a noise that sounds like a rattle or grinding noise that's coming from underneath on the passenger side of my truck. I put a mbrp y tip exhaust on and cold air intake with a throttle body spacer. The flutter and noise only happen when my throttle is down and my truck is warm. I've heard that something may be plugged, but that's just a thought. Anyone know what this might be?