Hey guys, Whats this noise at startup?

[BadBowtie03]

Huh..well Ive actually think that ive heard it maybe once or twice while the car is already running if that helps.. Its NOT a vibrating metallic noise like a metal zzzzziizzzzttzzzz sound. So let me see if i can think of something it sounds like.... It could kinda sound like a cell phone thats on vibrate mode thats sitting on a wood counter.. does that help?? IF you say the word "burnt" to your self but hold out the middle of the word like the "ur" sound... Its kinda like that, its also a low note not high pitched. It it will come on sounding it doesnt get louder or softer and then go off in an instant.. Oh and also I think that ive seen the revs move around a bit while its doing the sound and then go back up but nothing drastic.. For example it doesnt try to stall when its doing it... If injectors were the problem could higher flowing ones give it more power or no? Thanks hope that helps...