Picked up a 98 r1100gs. Choke on...bike starts up and runs fine. Remove choke and bikes dies. Will die even when its warm and I remove the choke. There is some soot or drizzle of black leaking from muffler. I am thinking this thing is running rich. I need to look at the plugs and air filter. I was reading previous threads about TPS, CO2 sensors, hal sensor etc. What is the correct trouble shooting order? Am I on the right track?