Engine Noise on my 2003 350ES

I hear a sound that sounds like a grinding squeal from the front side case when I let off the throttle, (it lasts for 1 second) it does not do it all the time just every once and a while when I snap the throttle and it comes down to idle, also when I shut the engine off something in the front of the motor still seems to be spinning for about 3 seconds than abruptly stops making a clunk sound, both these sounds come from the front of the engine where the clutch is. Has anybody experienced this?