engine stalls on 1999 Ford Contour

the engine stalls wend I put it on reverse or drive what could be the problem

Asked by for the 1999 Ford Contour
The engine dose not run right wen it warms up.
2 more answers
Your idle speed may be too low and the valve that controls the idle speed may need attention.
not sure,,however,,we gonna take vaccum hose off the fuel regulator and run it a day or so and find out,,,,seems a lot of these cars had weak fuel pumps,,