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Discussion Starter · #1 ·
what causes this and can it be fixed or just replace it? anyone else with this problem before. 4.0 6cyl 197000 miles. no power during acceleration
 

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Replace, but personally I would remove it first and verify power comes back, then buy a new one.
 

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Same here. I am just taking my 20yr old cat out all together and when it comes time to get it tested ill out a hi flow in. Good thing I can weld huh.
 

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x3 on replacing the cat. I just did mine on my 4.2. mine actually ran pretty good, or so I thought. I installed a 2 1/2" magnaflow cat and xl muffler. difference in power is amazing.
 
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