So I had the dreaded O.S. issue here in freezing Buffalo, NY on my 2001 4.4 X5. I read and read on here and had the typical symptoms. I removed the old O.S. and hoses and they were full of white sludge and the hoses were soft and deteriorating. I also changed the Valve cover gaskets. After I was done I took it for a ride and SES light was still blinking and it ran like crap! Same symptoms only worse misfiring and shaking. So I thought maybe I fouled the plugs. Changed them and still bad. NOW WHAT??!! Coils, Worse? Someone please help before I have to drop it off at the stealer. Thanks.