anyone got ideas? been doing alot of readin online and from what ive gathered it could be worn rotor head in the pump. i dont know exactly how many miles are on the pump since i did buy the truck used a couple years ago. yesterday while running the truck i noticed that when i first start the truck the fuel rate seems normal(between 7 and 9) but when it starts running rough the fuel rate goes up between 20 and 25 at idle cold or warm. what would cause the fuel rate to go up that high at idle?