Yep, this one has me stumped. I have a '02 Liberty with a 3.7L V6. I am currently getting 11 MPG and this is what I have changed so far; Plugs (burning clean just wore out), Air Filter very dirty, Oil, Radiator Fluid (drain & flushed), trans fluid & filter, rearend fluid and brakes (front & back).
I'm not getting any codes which rules out O2 sensor. All I can think is a vacuum leak that I cannot find. Is there anything I may be missing? I'd appreciate any help. My appologies if I started this thread in the wrong place.