My car used to start really fast as soon as I.

My car used to start really fast as soon as I turened the key but now its really slow to start cranks good and strong I have to pump the gas while turning over the key and it takes anywhere from 3 to 4 seconds to start and some times it starts fine. Once its started it runs perfect no miss in the engine or anything I've changed plugs and wires stil same thing I replaced the fuel pump 2 years ago when I got the car sometimes if I start it and drive a short distance like a few blocks and shut it off go in a store come out and try to start it up it will just crank and crank like its not getting fuel and I have to spray a shot of starter fluid in it just to get it to start but once started it runs fine what could it be. Also while the car is runnig there is a round thing with a few vaccum lines going to it located on the passengr side by the fire wall that makes a constant clicking sound that it didn't make before the thing has a little spring and valve I gues u wuld say and it sets inside of that round vaccum box right over a hole thaf sucks air and that's what makes the clicking noise.I know this because one day my car was idleing way to high and I noticed a hissing sound under the hood it was the top of that round vaccum box had popped loose and I had to snap it back together the car idles fine now but still hear clicking not sure if that has anything to do with my car being rough to start