Go to the hospital across town and pickup Sindacco. Stop in the red marker, and Carl speaks to the receptionist. She says there must be some mistake, because Johnny Sindacco was picked up by an ambulance a short moment ago. There are 3 ambulances driving around the city, each represented by a red blip on the radar. One of those ambulances has Johnny Sindacco inside. Get a fast vehicle and find that ambulance before it escapes. The ambulance with Johnny Sindacco inside is completely random (i.e., if you keep re-doing the mission, it won't always be the same ambulance). Ram the ambulance to see the driver's reaction. A message will appear on-screen to tell you if you have hit the right one. When you hit the correct ambulance, it will speed off with Johnny Sindacco inside. Give chase, and ram it constantly but do not shoot the vehicle. Eventually, two mobsters will get out of the ambulance and attack and shoot you with MP5s. Waste them, and take Johnny back to the meat factory in Whitewood Estates. Two cars will chase and attack, but they shouldn't cause much harm. Stop in the red marker and watch as two Sindacco mobsters take Johnny inside on a wheelchair. The mission is then completed.