im in norcal.
i found that there is actually two areas where the noise is coming from. one is a small device, about the size of a fist with the letters MOT on it. i think its something called a purge valve. i messed around with it a bit and the noise goes away, but grtadually come back. from what i gather, i need to replace the mount. will do this week.
as for the other source is coming directly from the engine. if its a sticking valve, what are some things i can do myself? can i use some sort of detergent type cleaner? (of course i will have it checked out, but if i can save a buck.....)