2010 Ford E-250. all of the sudden wouldn't start.

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2010 Ford E-250 4.6. Suddenly wouldn't start, showed low fuel pressure. Changed fuel pump control and fuel pump . Started several times, then wouldn't again. Loosened and tightened several grounds then started every time again. As soon as you hit a small hill going out of the driveway it stalls. Push back onto the flat ground and it starts again. Any ideas?

How long has your 2010 Ford E-250 had this problem?

problems started instantly a few days ago. no problems prior. and had just driven 50 miles with no issues.