Brief history on my Voyager. Had the infamous vacuum leak at the throttle body, after jumping thru many hoops got it fixed under warranty (new orings). As expected the problem came back, the dealer and Kawasaki were adamant the it wasn't a vacuum leak, so I got a gasket from Thunder and installed it as per the instructions that came with it (leave the orings in place, stick the gasket in and reassemble). I thought it'd come back with no grease and it may have. Fast forward to about a week ago. On a ride I noticed that when coming to a stop the bike would idle around 1200 and then eventually drop (never did that before), then after leaving it sit for about 10 minutes after the ride, when I started it, it wouldn't idle (same as when the vacuum leak was there). If I gave it some throttle it'd start and eventually idle. So I assumed (yes I know how it's spelled, and it may have got me) the leak was back. I ordered another gasket from Thunder and new orings. I installed the new gasket and orings and also greased them with some silicone, then waited 36 hours for the sealer to set. So, today I started it, so far so good, the it behaved for about a 25 mile trip. When I go home I let it sit about 5-10 miniutes, and when I attempted to start it, it wouldn't. So I gave it some throttle and she started, but ran like crap but eventually settled down, it did sound like it backfired and knocked a few times. tho. I let it sit again and took the cover off the throttle body side. Again, it wouldn't start without giving it some throttle, but when it did, it definitely backfired out the throttle body. It eventually settled down again. So I let it sit at least 30 minutes and she started ok. At this point I'm fairly confident that it's not a vacuum leak between the tb and intake, and I'm not looking forward to taking it apart again (not to mention ordering another gasket, orings etc). Anyone have any ideas? At this point I'm at a loss.