Just to chime in and let you know I have a similar issue. Sounds like a slight misfire at idle. I haven't been able to track it down yet, and am not sure if it's supposed to be considered normal, but I'm doubtful. I've replaced wires, coils, injectors, plugs, vacuum hose to the injectors, O2 sensors. I'm planning on taking out the DISA valve next, and I think the CAT may be a little wonky. The exhaust is a little noisy when the engine is cold. The engine seems to run fine otherwise. |