1998 dodge ram 318 4x4. check engine keeps coming on keeps blowing threw o2 sensors. ive replaced 4 02 sensors always comes up front shorted to voltage.bank 1 sensor one. blows threw fuel like nothing and when you accelerate blows black smoke out tail pipes from running so rich. when i put a new o2 in it runs great for about an hour then does all the same all over again. just had new exhaust put on not because of back pressure or anything along those lines. let me know about any ideas?? thanks mud slingger

 

Check for plenum leak

 

check for bad wires....

 

Did you have your CAT removed for your exhaust installation?