Codes P0191,P0171 and P0174 are showing up.car cut off on me twice and now it is running ok,except the check engine light is on. what could be the problem?

Same problem here Code P0191 (low fuel pressure ) Then it died. Had to replace Electric fuel pump. Check around for best repair price. Ford House charge me $700 and found out the Average repair cost should have been $295-395.

Clean your egr valve