My throttle is very light switch like at slight openings. This is a 2004 4.0 TJ. Worse when cold, but there all the time. There is no easing into it. Replaced the TPS some time back because of low power/loss of power at certain throttle positions, and it fixed that problem, but still have the abrupt on/off. Does the IAC have any effect on slight throttle opening. Idle seems to operate fine. Revs tend to hang up a little on gear changes when cold, but when up to temp, that goes away. Anyone else had this?