00 XJ Sport 4.0 Auto 4x4
K&N FIPK
Flowmaster muffler
(K&N and Flowmaster were installed 1+ year ago, problem started recently)
Sometimes, when I start my XJ, it'll crank over, catch, then instantly stall if I don't have my foot on the gas. When it refuses to idle, if I open the throttle, I get...