if you got fuel it should at least try to start. if the vac line off it has gas in it, or smells of gas the fpr is bad.

what are these new injectors? stock replacements?

check for spark yet?

side note, the injector harness can have a bad spot that you aggravated by taking the plugs off. so you can look for a break, or also test the power at the plug, test light works, or you can take a marker light out the head light and push it in the injector plug. you turn the key to run and the bulb should flash a few times, or the test light will flash if its got power. it only flashes a few times then you have to re cycle the key, its the prime for the engine to start. if it dont flash at all you got no power to them.