Got some bad fuel other day which made truck idle real bad on first start either in morning or after sitting all day at work. This morning cranked truck to same condition after driving for a little strange clicking noise appeared like something hitting flywheel. Truck still has power on accelerationthrottle the noise becomes louder and faster found nothing touching anywhere. Weirdest thing is that no matdter where you are standing at vechile noise sounds it coming from somewhere else.