Hi, There is a weird squeak eminating from the left side (opposite the Serpentine belt). I disappears after going above 1100 rpm. Also, the idle is rough during warmup and will even shut the engine off while stopped at a light. Once the engine is shut off the restarted, the squeak remains, but the rough idle disappears. Car has 100k miles (just rolled over). 2002 Mercury Sable Thank you in advance.