Question about 1996 Jeep Grand Cherokee

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96 Jeep ZJ with 4.0L removed manifolds to replace core plugs

Now I have steady check engine light with codes 72 & 55 help with what they are and I will be able to fix
Had vacuum leak and resealed that to day and cleared codes and still that check engine light came back on> It is running rich and bad MPG's now. How can I 'drive' the computer to make the engine to run lean in park to burn off any carbon like i did with the GM's in the 80's?
Robert

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Hi glad to help 72 is Catalytic Converter Efficiency Failure and 55 is end of code stream thats a normal code here is some info if you need more let me know have a good day DB96 Jeep ZJ with 4.0L removed manifolds to replace  - c334cad.giff46ba81.gif

Posted on Feb 19, 2009

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