1999 Pathfinder throttle hesitation and high idle in park

[Meter]

Hi Everyone,

I'm hoping someone can help me determine a fix for a problem I'm having with my wife's pathfinder. Here are the symptoms:
- When at a dead stop depressing the brake in drive at a stop sign, normal idle, then throttle is depressed, short hesitation then it drives forward
- When at idle in park, RPM goes to 2000, then if the put into gear it jumps forward

Neither of these problems happen 100% of the time and seem to be sporadic. There is no loss of power when driving, no backfires, no problems starting.

Here's what I have done and noticed so far:
- Had code reader hooked up at Auto Zone and they pulled EGR valve and knock sensor. I don't think either of those is the issue.
- found a very minor coolant leak at the throttle body
- recently removed the distributor and reinstalled when looking at the pesky 45 degree coolant hose in the front of the engine. The distributor was marked and installed in the same position that it was in before. However, it ran rough afterward for a few then was better. At the same time that I did that I replaced a short cracked fuel hose that is located on the fuel rail just below the intake in the center front of the engine. Near that 45 degree hose. Not sure why it ran rough after this.
- Pulled and inspected all plugs, wires, cap, and rotor and all looked good. Although I don't know how to tell if a rotor is bad by looking at it. I just replaced plugs, wires, cap, and rotor about a year ago though.

I'm not sure what it could be and I don't want to go out and start buying different parts in hopes of fixing the issue. Has anyone else experienced this same problem?

I'm thinking it could be a bad distributor/coil, air flow sensor, upper O2 censor, idle air control valve, throttle position sensor, or something like that. All this started right after I fixed the cracked fuel line and removed and replaced the distributor at the same time, but that doesn't necessarily mean this caused the problem. Does anyone have any good ideas on this one?

Thanks!

[Blindaviator]

found a very minor coolant leak at the throttle body

Between that and the idle I would say the IACV and maybe the throttle position sensor...

IACV controls idle and TPS tells the system when you depress the pedal to accelerate....

[04pathse]

found a very minor coolant leak at the throttle body

Between that and the idle I would say the IACV and maybe the throttle position sensor...

IACV controls idle and TPS tells the system when you depress the pedal to accelerate....

Yes there is a gasket that leaks over time that can cause the IACV to short out a chip in the ECM ,