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Original post by: m3rciless ,

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How did this start happening? Like what were you doing? Lots of times nothing you did caused it, just a bad part(s).  Did you buy it that way? Just clues to the puzzle.

Odb 1 doesn't always throw a code when it's a small flux.

Does it throw a code? If not then:

Check your - vacuum lines, egr valve, o2.

*If vacuum lines show any wear then check them (careful they are fragile)

*Clogged egr happens but no very often, or even stuck open.

* test the ohms on the o2 sensor wire. 

I would also test the sensors you replaced especially if you bought off brand, not common but they can just be bad.

It could be your catalytic converter.

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