plugged catalytic converter
this is my first post to this forum, but i've researched a lot of information off this site. Thanks for all the information. I am having some reoccurring trouble though..
I just replaced the plenum pan gasket on my '95 ram 5.9. 110,000 mi. It had a definite pool of oil in the pan. My cat. converter had plugged up after a four hour trip. So, I thought the plenum leak might be the cause. I replaced the stock cat with a magnaflow hi flow system as well as a new flowmaster exhaust system. New plugs, dist. rotor/cap, 180 degree thermostat, new O2 sensor, new front camshaft seal. The truck ran so much better, it does not burn or leak any oil, better gas mileage. I just drove it to South Dakota and back from Seattle. It ran great all the way there (1200 Miles), but on the way back , the cat converter plugged up again. I checked down the TB, and it looks clean as it was when i put the new gasket in. i can't figure out what to check next. Burnt valves? I am thinking about dropping a new crate motor in, but i should figure out what is causing it to plug up the cat. converter. could there be any emissions parts that are faulty?
another question. could my new magnaflow cat. converter be totally plugged and junk now after 3000 miles?