Hello all, new guy here. my problem is really odd, 1987 E-350 class c motor home, 460 4v auto. will start fine cold, run for 10-15 minutes, then die. will not start for 30-40 minutes, then will start again and run for 10-15 minutes, then die again. only happens when sitting still, when driving, will run all day. At first, removed air cleaner, had gas, put in either while cranking, nothing. checked and no spark. then after 30 minutes, she started right up.
I know, don't stop!