i have a 96 formula and it has had a knocking noise for 40k miles now. it sounds good on cold strtup but get louder as the engine heats up. i adjusted the rockers and the tick went completely away for abotu 30 mile. and the knock is louder from under the car. now do you guys think its a lifter or worn cam lobe or soemthing more serious. i need to find this thing.

but other than that the car runs strong, but is sucking gas bad

 

and the enigne light is on for the rear o2s could the two things be connected