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Hi , I know better but... getting ready for a trip decided to work on jeep all weekend . replaced factory header with aftermarket, put water pump and radiator, 135 a alternator, front locker axle seals new axle ujoints and hub bearings.
started jeep seemed a little high idle thought maybe battery was disconnected and it needed to learn idle.

it seems to hiccup at 2200 rpm no check engine light pulled codes reset and checked codes again

have codes po 443 po123, po113, po158,po121 I looked them up but don't know where to start

I know some of those repairs wouldn't effect engine performance . I also know 1 thing at a time keeps you from chasing different things

thanks just became member but have stalked this site for a while.
 

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Id start checking for vacuum leaks and clean out your IAC sensor and TPS sensor.

New header--did you get your 02 sensor installed correctly?
 
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