My 08 klx was running just fine. Loaded it in the truck and took it to the track just to ride around the pits and it didn't want to stay running. I had to constantly turn up the idle and as the day went on I had turn it back down. The idle would sometimes surge up an down. It has the PC T-4 PIPE and I did rejet and put the TB pod filter on the bike. Any suggestions where I should start looking?