2011 Outlander 800xt. I've got a Looney Tuned Slip On, twin air filter, XMR stealth snorkel kit, on cold starts it stalls when idling. I've replaced fuel pump, checked plugs, cleaned throttle body. I contacted LTE and they said you don't need to run a programmer with just the slip on, but I think I have a lean condition. Once the bike warms up it runs/idles fine. Any ideas?