Rattle?
 

Lately, when I start my car, I get a loud rattling sort of sound coming from the engine. At the same time, the tach hovers between 1600-2000 RPMs. The loudness seems to go away after 5 minutes, but the rattling subtly remains when my foot is not on the gas. What is this? It's a '94 Acura Integra LS.

you mean your idle is high in conjunction with this rattle? or does the rattle happen only between 1600-2000?

on my celica, i had to track down this most annoying rattle that I thought was a heat shield. turns on it was the intermediate mount thingy that supports the long axle. Fools didn't put any bolts back that they removed!

You might check for things like this if it is just a vibration. any metal on metal that isn't bolted together is potentially a rattle.

when was the last time you had a valve adjustament done ? my car makes like a clicking noise on stratup till oil gets to the head and then sounds like a diesel at idle