I was told to separate some issues from a big post I made so here is one of them. While driving between 45-60 my RPM bounces between 1700-2000 and have a high idle issue that's on and off. The RPM bounce feels like the last two gears are shifting back and forth (or if you press the gas hard on newer vehicles it shifts down to increase the RPM and shifts up afterwards to continue speed, and feel a light jerk when this happens) is the best way to describe the feeling. Part's I've changed recently are TPS, IAC, MAP (small rubber elbow on the way to be replaced), crankshaft position sensor, spark plugs and wires. My second year having the TJ I changed the distributor disk sensor, rotor and cap. The third year I changed out the fuel pump. Hope this helps and thanks in advance!