I have an astro with a p 420 catylitic converter low effitiency
2000 CHEVROLET ASTRO
145,000 MILES
HORSESHOE
MEMBER
7 POSTS
FOLLOW
while driving engine slightly hasitates seems to indicate missfire
Nov 2, 2011 at 7:30 PM
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ASEMASTER6371
AUTOMOTIVE REPAIR CONTRIBUTOR
52,796 POSTS
cat has failed most likely from a missfire you have. the unburned fuel is what kills the converter.
i suggest you resolve the missfires and you will still most likely have to replace the cat as well.