2000 Impala Running Rough

Started my 2000 Impala this morning and was running very rough and the check engine light was flashing. The same thing happened again when I started it again in the afternoon. Thinking in might be the cat. Any other suggestions would be helpful...

Started my 2000 Impala this morning and was running very rough and the check engine light was flashing. The same thing happened again when I started it again in the afternoon. Thinking in might be the cat. Any other suggestions would be helpful...


get the code reader //post backthe code.

I know this post is old, but the exact same happened to my car last night. The check engine light is flashing and the car is running a bit rough. I had a similar problem a few months ago only to find that one of the coil packs needed to change (but I don't remember the 'check engine' light flashing)... could it be that the other pack now has to change?

A scan will show which cylinders are misfiring.

Started my 2000 Impala this morning and was running very rough and the check engine light was flashing. The same thing happened again when I started it again in the afternoon. Thinking in might be the cat. Any other suggestions would be helpful...

I had that issue with my 2002 Impala. 2 of the 6 spark plugs failed. I changed the plugs and all was well. Well, they did have 151k miles on them. LoL.

If you don't have access to a code scanner, I believe Auto Zone will do it for free.

if u think it is the cat, take the ox sensor out, if it runs better more than likely the cat / exhaust is clogged