Under the hood

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HELP!!! MY 98 ford tarus runs fine all winter but when the weather is hot and i run the airconditioning after 20 minutes it stalls i restart it it loads up and stalls then after a few tries it wont start at all just cranks over. I had a dianostic test it gave a code P0401 insufficient EGR flow detected i have checked the EGR its fine i replace the following , fuel pump , crank sensor , coolant sensor DPFE sensor. Anyone know what is causing this problem???