2001 Chevy Silverado Rough Acceleration/Idle

I've noticed that since I put new spark plugs in my truck that during acceleration its quite rough, as well as with idling. It seems to studder/hesitate in the low RPM's (below 1500rpm) and while idling. The spark plugs I installed are NGK Iridium Tipped ones with the proper gap (.060in.) Nothing leaks, nor can I smell any weird smells. I thought it could be water in my fuel line/tank, bought some water remover and nothing. I also thought that maybe its one of the spark plugs, I checked them all out and everything looks fine. (There were a couple that where black, so I swapped them out with my old ones and nothing, same thing) I did use anti-seize on the threads of the plugs, but I only put it on the threads. I thought that maybe one of the plugs may not be fully inserted so I took them all out and re-installed them and tightened them. I checked the spark plugs' boots and they're fine, the coil inside is still crimped to the boot. I also suspect my fuel pump, when I accelerate I can hear the fuel flowing to my engine, usually happens only when its cold out (once the engine warms up it goes away) I hear it by the passenger side, down by the glove box. In the higher RPM's it runs fine, when I am idling, everyonce in awhile my gas gauge needle on my dash just drops straight to empty, that lasts for a little bit (its quite erratic, sometime only lasting a couple seconds to a few minutes) then it jumps back up to where its suppose to be (well in theory thats where it was before it dropped to empty) I hope this is enough information for you, and any help would be appreciated, thank you.