Original post by: m3rciless ,
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.