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Rough Idle???

kenny811

NAXJA Forum User
Location
Damascus, OR
Installed a new 4.0, (renix) and starts right up & idles so smooth. But as soon as you get up about 1400 or higher it starts to pop and backfire through the muffler. It sounds like the cat might be clogged, but not sure. All the sensors are fine. The only sensor I have not checked is the coolant temp. Any ideas? Is it possible for the cat to gloog?

Thanks
Kenny
 
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