Need help from anyone who has experienced or heard of these 05 GT symptoms. Have read hundreds of posts and found nothing quite like it, so don't know if combination of issues hit at same time. Original owner, 140M on it now with no major repairs - starter/alternator/battery 2 years old, proper maintenance. Mustang running fine, then won't start after coming out from work, cranks fine didn't seem to be getting fuel. Go home to get tools, but started right up. No codes, nothing else to do other than begin checking forum for info. Runs great for four days, does it again. Old school, so shake trunk and it starts up right away, so fuel pump right? Replace fuel filter and fuel pump, runs great for a week then won't start after running errand for a couple of hours. Forum guys say fuel pump driver module or connectors, so check & change FPDM to be safe, connectors look good. Runs great for 3 or 4 days, same thing. Read all about sulphur and put Techron in, starts and runs fine for another few days, then stalls while driving at slow speed. Sits for a few hours, starts right up, more forum searches and it sits for a few days as read more forum blogs, talk to online Ford tech (paid) who says fuel pump (psi great when running) and upgraded pump, so no way same symptons. Ohms good for wiring as well, and cleaned jet transfer pump carefully too. Fuel relay switch and fuses replaced as well. Still no codes through all of this. Changed mass airflow sensor as well as saw a similar thread, but no effect. Have read a lot of threads about throttle body issues (have always kept clean), and fuel rail issues, but many local pony "experts" don't believe these would prevent starting, just rich or lean issues when running. Still let it run some as items replaced (no error codes other than P1000 as I hoped a PCM reset would work), and now stalled on highway at 70mph cruising, no warning and towed home. Will not start at all now, great cranking power. Any thoughts/ideas or add'l suggestions before towed into dealership would be appreciated. Fuel & speedometer gauge motors going out as well, would that malfunction cause car not to start? Thanks everyone! Gary - seriously wanting to win this one.