I had a similar prob with my TJ - was using heaps of fuel and black smoke (obviously running rich). Took it to a mechanic mate who plugged it in and found the TPS was buggered, showing the throttle was open 90% even at idle!!
Around the $200 mark, 5 minute fitment of a new TPS.
Not saying this is your prob, but get it plugged in and checked!
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