08 XP runs on one cylinder/really rich NEED HELP

My 08 xp has recently started acting up this year. Last year 1000 miles and no problems except belts which I have cured. Now it acts like it is running on one 1 cylinder, intermittently (more often than not). Dealer did replace the needles and I installed an SLP intake and Goldfinger throttle. First weekend was great, now not so good. I have checked and rechecked everything I installed and can't come up with anything. I am going to disassemble and clean the carbs tonight and see if anything is plugged or loose, but I am running out of ideas and hair really fast. Appreciate any help!!!!

Here is a list of things I have checked:
Fuel has no water in it
Blocked off SLP intake to make sure it wasn't causing problems
Checked DPM hose for kinks/leaks
New plugs twice
Power valves are clean
Does it with or without carb heaters

Trjed that also, both seem to be firing. Just finished tearing down the carbs and all looks well there too.