uclaccord

1) feels like i've got a pulsing idle...not revealed by tach...can hear it if i concentrate really hard on it...but i can feel it surging thru the pedal...i ran chevron fuel injector cleaner w/ techron(or whatever that stuff is) just a few months ago...also used seafoam to clean my tb a month or so ago...what else?

2) hear like metal shaking in two places...first place seems to be from the rear passenger susp tower...i tried the bolts and they seem tight...second place is somewhere in the engine bay kinda low...like near the downpipe or something

i know these are really vague...but any suggestions on what i can do for further diagnosis or to fix it or anything?...thx guys