2001 Mercury Cougar Noise coming from airbox

have you found the problem,mine is starting to do the same thing [quote:73bd934eec="TA machinist"]Engine Mechanical problem
2001 Mercury Cougar 6 cyl Two Wheel Drive Automatic 85,000 miles

The car makes a loud hum noise from the air intake and the motor starts to shake and run rough at 4000 RPM[/quote:73bd934eec]

replace idle air control valve...if not it one of the sensors on or around intake or throttle body could be going bad...hope it helps if not already fixxed...