Am I getting Hosed by the Dealer for Catalytic problem?

2007 MITSUBISHI ENDEAVOR
52,000 MILES • 3.8L • V6 • AWD • AUTOMATIC
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COLORADOGENT
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Car has 52K. Took to local respected shop for tune-up and check Service Engine light. Car running a little rough at start-up only and missing. They state car does not need tune-up till 100K and Catalytic needs replacing but can get replaced by Dealer under 80K Warranty. So took to Dealer, they say needs plugs and wires and have to drop the manifold to install. A cylinder is not firing well and causing leakage into Catalytic. Wants $500 for tune-up before replacing Catalytic. I don't trust the Dealer. Expert advise anyone? Thank you
Aug 16, 2014 at 6:51 AM
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WRENCHTECH
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Well, if it is truly misfiring, they are telling the truth about it ruining the Converter. Something ruined the Cat. Although the plugs may not burn out until 100K, you can still have a coil cause a misfire and ruin the plugs. Don't rule out a defective plug either.
Aug 16, 2014 at 7:50 AM