Here's an update. The dealer called and said that the plugs and coils on cyl. 2 and 3 need replacing, and the cat was OK. Cost for this work to me about 400.00. I approved the repairs and wanted their assurance that if it was the cat they would warrantee that work. He said the truck was out of warrantee (stated it was 5 years, 80000 mi) and it wouldn't be covered since the truck is older than 5 years.

He called back the next day saying it was the cat was NG and that the misfire caused it to fail, but then surprised me when he said it WAS covered and he had the wrong part number before.... I don't know but I'm glad I don't have to pay.

Bridge. You were correct about the shortage. It will take until early November for the cat to be delivered.

Thanks to all.