I sometimes have to spray ether to get it started. why?

1st step is to see what the coolant temp. sensor is reading when it is cold. Not the gauge on the dash but the sensor for the computer. If it is reading too high the vehicle will not get enough injector on time for a cold start. Basically the computer thinks the vehicle is already warmed up. If that's ok next is to test fuel pressure. If it's low again the vehicle will not get enough fuel flow for a cold start.

when you find out let me know