Vaccum spec?

I have a 96' quest that after I replaced a fuel injector barely idles and will die after I rev it up. It wasn't idling at all at first but I found a vaccum leak and fixed it now it idles very low but if I pump the gas it isn't able to catch itself and dies. I measured the vaccum at 18 but I can't find any specs on what it should be. I've also sprayed every vaccum hose and port I can find with brake cleaner trying to find additional leaks along with the air plenum. Anyway if somebody knows where the vac pressure should be or has any ideas Id be greatful for the info. Thanks