So I have the 3.8 in my jk and for the last month I have been hearing a rattling sound in the motor. When I first crank my Jeep and Start to go for about the first 50ft I hear a rattling. It seems to be coming from the bottom of the motor. I have checked all the heat shields and they are tight. It kinda sounds like loose bearings. Has anyone else had this issue or any suggestions? Thanks