Just recently on a drive in the wifes 67 dart 318, (I can't belive I wasn't working on it) We experienced a sudden run on comming up to a turn made the corner RPM's up high pulled over. A small black vacum cap had fell off of a tree. Funny thing was I went looking around the parking lot for a small hos, screw, etc. Wife asked what was I loking for. I told her. She reminded me earlier in the week I found 7 or so blue vac caps in a parking lot and they are still on the floor in the back! Dang she did it to me again@! Anyway we got home and I replaced all caps hoses!