Why would a 1995 Ford Taurus with a 3.8 engine and fuel injection start when forced but not idle?

because it is not getting enough fuel. it sounds like your injectors are clogged or your fuel pump is going bad. try running some premium gas and some fuel injector cleaner through it and see if that helps. if not then replace your spark plugs and wires. a weak spark will not ignite the fuel propperly. no burn = no go. It could all so be the TCV or Throttle control valve, which controls your throttle at idle speeds. So if you hold the gas pedal down you can make it start but it won't idle on its own. AutoFox, sgfox78@yahoo.comm