the car that i have is a 1999 ford contour, 4 cyl, fuel injection, built in aug. of 1999. the car stalled so i had the fuel pump and oxygen sensor changed. now the car putts and stalls, (had this problem from once but had car scanned and was adviced to change the master air flow sensor) the car starts and runs but like i said putts and stalls.

Optional Information: 1999 Ford contour 4 cyl
Already Tried:
change fuel pump
change oxygen sensor