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Ok. My 4.0L is running great, just keeps popping these two codes up. P0141 P0144. I just did the head gaskets on the motor and while the heads were off, i had them sport tuned to stage 1. Ported, Valves ground, Valve seats re-angled, new seals, etc. It also has the 44mm throttle body, complete sport erxhaust, headers to Jba sytem. K&N intake. Probably more that Im leaving out. The question that I am presenting is that I am wondering if the codes the computer are throwing are due to the system running too lean. The problem is that the mileage is way down as well, which makes me wonder about the o2 sensors. The motor runs great though, idles nicely, has tons of power. I would just like the pros opinion about this dilemma. Should I get a power programmer and re-tune the system? If so which one, hypertech, Jet... Any criticism/input would be greatly appreciated. Thanks a million.
