Hi guys,

When sitting on idle i can hear a unusual noise coming from the throttle body. Sounds like a puffer noise, or the butterfly opening and rand intervals, which are very consistent. Also idle is dropping and sounds like its going to conc out, but doesnt. Also when driving at a consistent speed ie 50 i can feel the car pull randomly

any help will be appreciated

What car is it first of all,

Also it could be your stepper motor playing up, the thing witch sits on top of the throttle body which controls the idle

Sorry guys its a au series 3 xr6 vct.