IT is quite possible that the cat has started to disintegrate. I had that as one of the problems on my truck a while back. The cat started to disintegrate and pieces were plugging up the muffler. Sounded awful. The low RPMs didn't seem to change much, but very bad upper end. Try disconnecting the exhaust in front of the cat and drive it around a little. That helped me verify my problem.
This site and all original materials contained herein are Copyright 1999 - 2013 by OutdoorWire, Inc. -- All Rights Reserved.
You may link freely to this site, but no further use is allowed without the express written permission of the owner of this material.
All corporate trademarks are the property of their respective owners.
This publication and OutdoorWire, Inc. assume no liability for your use of the material contained within this site.
OutdoorWire, 4x4Wire, SUVWire, JeepWire, MUIRNet-News, and 4x4Voice are all trademarks and publications of OutdoorWire, Inc.