Whirring noises during idling indicats it should be engine speed related. Possible sources would be the drive belts and components driven by them. You need to check the alternator, A/C comporeeos, idler pullies.
Poor acceleration could be due to power losses and it could be engine or transmission related. You need someone who knows about cars to test and determine what is wrong.
Sunday, November 21st, 2010 AT 8:59 AM