I have an 04 RSVR and have had a vacuum leak feeling for quite some time now. It will fire up and rev itself up to the normal cold-start idle speed, but once it idles down to the normal idle speed it has a weird missing phenomena (and sometimes it will die if its started from cold). If I have been riding for awhile and shut it off and then restart, it wont die when started, but still has the weird vacuum leak missing feeling going on.
I first replaced those two tiny lines on the MAF sensor on the airbox, but it didn't help anything. And then I replaced the two intake boots below the throttle bodies and then replaced the throttle bodies (because I thought one of the injector seals on the left side was bad and I had a spare set of TB's on the shelf so why not). But to no avail. I still have that weird same sputter at idle, and I still have weird small hesitations at cruising throttle range. And also it kind of sputters and hesitates when rolling back on the throttle. At full throttle it still pulls fine.
I have done a ton of forum searching and I'd like to think that I'm not an idiot as I have worked on multiples of bikes and cars all my life. But as of right now I am truly stumped. Any ideas?