Thanks for response. Since the initial issue occurred, I took it camping last week and drove approx 200 miles round trip, longest stretch at any one time was about 65 miles. It ran and drove fine, but the weather last week was 25-30 degrees cooler. Wondering if issue is specifically related to heat, I have no experience with the 460 engine but saw a few posts about not doing well in heat since I first posted. Would a clogged fuel pump produce a good fuel pressure test? With 36,000 miles it may be the original one from 1989, but too bad its located inside the tank. I had it tested and pressure was good. Fuel filter was changed the day it happened but nothing else has been changed. I did fill the tank up from a quarter till empty, all the way until full the day before the incident happened, maybe fuel type, but having owned a Ford 6.0L F-350 the sound was different than the injector problem I have experienced in the past with my truck. I will change the O2 censor and module as you mentioned.
