Hi All, I am in San Diego and I have a great general mechanic who does most all my work. My mustang needs to get looked at by someone a little more specific to Mustangs -I think. It idles rough when stopped in gear, but idles smooth as can be in Park or Neutral or while driving. Mechanic checked everything, but found nothing. No codes or other issues, all service is up to date. Just says it’s an old car. At all stops and waits I have to shift to neutral, otherwise it’s a royal rumble. Course it cruises like a dream, good gas milage, just doesn’t like stop signs, lights or drive-thru’s in Drive. Ideas, siggestions, shops?!?! Thanks!