idle problem!, wtf is wrong now? Options

[tonytutino]

so i just replaced my intake manifold allen-head screws and now my car doesn't want to idle. the RPM's just keep dropping when the clutch is engaged. and the crazy thing is if i loosen the screws (just one in particular), the engine doesn't bog down or anything and just runs normal BUT it makes a horrible loud whining noise from the screw hole. i didn't know the amount of torque on those had anything to do with airflow. and only the one closest to the driver side firewall seems to control it. this is out of my hands and i have no idea what is wrong.

also, while at idle, a thump can be felt and the rpms drop a couple hundred then pop right back up. it seems to have a correlation with the tightness of the screws as well. i dont get this at all.

anyone know anything about this? thanks i really need the help -Tony T

[tonytutino]

just tried that man, didn't work. what i've noticed is if i turn on the car and just let it idle its fine. but the second i give it gas and let it idle again, thats when it starts bogging down.
however, now the rpms wont drop enough to kill the engine.
its sitting at about 750 on idle. BUT the problem feels like minor little mis-fires. and they just keep getting worse. it sounds like little pops and the RPMS sink then perk back up. it used to just be once every few seconds, now its just really frequent. ugh.