Why'd you replace the cat? Because it was clogged? You know why it was clogged? Read the contents of that link again and then proceed to pull off your throttle body and check for pooled oil.

O2 sensors should also be replaced if they haven't been already...NTK or NGK brand

 

Matt Nickerson, If you could tell us exactly how you get 26MPG, we would be eternally grateful if it really worked. Please! Wanna know!

 

I only get like 210 miles to a tank and I do the math how much gas I put in and how far I went, I get like 8.5 or 9 no matter if I drive like a grandma or in NASCAR the truck has no loss of power by no means


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No loss of power? Impossible. 8MPG? Only if you're towing. There has gotta be a difference in MPG if you keep your foot out of it.

 

why would I lie? I'm obviously trying to get people's opinions on what could be wrong and just saying what my symptoms are


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Bad o2 sensors as a result of a blown plenum. Power loss might set in when your new cat clogs from a blown plenum.

 

how new are your brakes? any chance they are hanging up?

 

It's a joke, son, a joke. Laugh!

 

my front brakes are new replace calipers rotors and pads but haven't checked rear drums


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what are you talking about? project rust bucket has a 5.9 and is has gotten 27mpg which is pretty good for a truck without overdrive or a lock up torque converter. project rust bucket can also put out 972rwhp.
http://www.dieselpowermag.com/featur..._d250_cummins/