Hey all, I just saw this thread and figured I'd update everyone. I replaced all 4 o2 sensors (NGK irrc) back in May and that fixed it . Passed smog with no troubles. Today it has a hair under 300,000 miles, and is still running all the factory original cats! The motor is untouched (the valve covers have never even been off) as is the trans... which just recently gave me a little trouble, but thanks to some guidence from you guys here on Moparts I fixed it by just changing the trans sensor and pressure solenoid . I just got lucky I supposed... well that, and Mopar built me one great truck .