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Problem starting

188 Bellerive Lane, Summerville SC
What I Drive
2008 Shelby GT500
2008 Shelby GT500, 24,000. Have driven less than 3000 miles in 7 years. Just developed a problem starting out of the clear blue.Engine spins won’t fire. Will do this for maybe 15-30 secs. Once started runs great and no prob on Highway. When shut off and wait 15-20 mins does same all over.
Ford had it for 3 days and couldn’t find the problem and blamed old gas. Have filled twice this year with BP 93.
Have never had problem with this gas. I think if the gas was bad I would have problem on the road.