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Can you get a print out of your readings and post them here? Maybe we could help you narrow it down to what the cause is.
I was running a '82 Caprice wagon from 1990-1995. It passed emissions until I burnt a valve coming back from Fla. It had a '76 350 in it, NO emissions equipment, no CAT, no computer. I made up a whole bunch of dummy NY state 10-day inspection stickers for it, ran it for about 18 months that way.
Bob
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