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I have an 08 JK with 2.5" lift an 33s. 140k miles. It started running rough and had a check engine light come on, I checked the codes and it was for emissions and torque converter. So I figured I'd do some much needed upgrading and maintenance. (New) shocks, springs, all four catalytic converters, muffler, torque converter (tranny got new fluid and filter), plugs, wires, battery, valve cover gaskets. No check engine light but is STILL losing RPM power while driving. Starts up just fine, runs good tell rpms drop and I can give it gas for it to do nothing. Anything will help at this point.
 
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