Engine Performance problem
1975 Chevy Silverado V8 Four Wheel Drive 200000 miles
i have a 1975 3/4 ton chevy scottsdale. And my truck is idleing at six hundred rpms, and baogs down when I give it gas driving at about 45 and 2500 rpms. It just started cutting out fully dead. Its been really warm where I live. What is vapor locking and what would cause it.