went to the auto parts store and replaced every vacuum line that is connected to the iacv... and is still making the noise. took it to the shop and he said it sounds like your iacv is stuck open which is why it idles fine but doesn't go good. he was sayin since it is stuck open when u start to go the car thinks it is still idling and its not letting the MAF take over like its suppose to which would cause the car to not wanna go. does this sound legit or do u think its bullshit?