I have a 2003 ford taurus that had a radiator leak so I replaced it and then started to have some rough idling And would only start when I press the gas like pump the pedal now won't start at all

Did all this start right after the radiator was installed? If so double check any electrical connections that you might have unhooked or bumped during the radiator install.

Don't just throw money (parts) at it, figure out what's going on first. Low Fuel Pressure? Weak Spark from the coil? Plugged fuel filter? By the time you throw a couple of hundred dollars at it (and still not fix it), you could have taken it to a shop and got a proper diagnosis. Just guessing rarely fixes anything - except your wallet. Now, if you like to throw money around, my address is..........

Yes this happen right after we replaced the radiator and I was low on oil jus change spark plug and add new oil befor right after we changed the leak it was ideling real bad then it just stop starting now I can't get it to start

Thanks everybody the car is running now it was the thermostat wit h mess up my first radiator and a misfire but it still ideling rough gotta figure out how to fix it I replace the EGR valve for nothing but better safe than sorry but not sure why it still rough any ideas