My Question is what lb. injectors are in a stock 1991 f-150 4x2 stick long wheel base 300 i-6 efi on east coast. 239,000 mile may need changed ? has a slight miss at low & mid rpm's comp. is 155 lbs cold. Has new plugs ,wires cap rotor, fuel filter, pvc valve . All ford parts oil changed every 2,000 miles or 2 month's. Going to run a can of BG 44K in it this week.

Thank's , Don

 

If they are yellow tops, then they are 19 lb/hr, if they are gray tops, they are 14 lb/hr. I know the older 300's used 14's but I don't know if Ford ever upped the size or not.