About half the time that I drive my car, if I get out and the engine is still running it makes a horrible whistling noise. Wondering if anybody had this happen, or could maybe tell what is causing it?

Vacuum leak, leak on your air intake??

To test for vac. leaks, get some ether (starting fluid) and spray it on all your vac. lines (one at a time), if the engine rev's, you have a leak. Also spray some on the joints of your air intake, again, if the engine rev's...