[mparmley]

Just wanted to add that i had replaced exhaust behind the Cats. New mufflers and pipes.

I cleared the code last night and have driven it around town and on the interstate for about 20 miles. It seems to run real good. Nice acceleration no hesitation throughout all ranges. Could this have been the problem. I only had one fault code and it was P0420. No others.

My old exhaust had a leak at the flange behind the last cat going into the muffler. And the muffler was shot.

Thanks everyone for the replies.
Mike