I get a generic p505 code have replaced 3 parts got better each time but now its getting worse ,I replaced one electric solenoid the idle air valve and the Idle air control valve.The vehichle wont start without stepping on gas but once warmed up its fine but after about 30-60 min it starts to hunt at idel between 250 and 300 rpm at stops and I here some kinda mechanical clutch kicking in back and forth? Anyone know or got ideas.Its a 2000 montero sport 3liter auto 4wd LS

 

Ended up being a stretched throttle cable ,but wondering what the ideal idling rpm is

 

i think standard idle speed is somewhere around 700-800 rpm. Make sure you don't "control" idle with the throttle cable.

 

Oh why it was stretched and loose we adjusted and tightened?

 

What I mean is - do not install throttle cable taught enough to affect the idle. Years ago, when I was working on another vehicle, it would not keep idle. The only way i can keep it from stalling at traffic stops was to keep gas pedal depressed while in neutral. That way it idle at higher RPM but not stall. Me, not in my smarter days, decided to outsmart the car. I tightened the throttle cable, so that the gas pedal did not return throttle plate to fully closed position. That worked for awhile, but once in awhile the engine would just rev up much higher at idle. I did some more poking around and found another part in the idle control system that was malfunctioning intermittently. That was why it would not keep "normal" idle. Once I got that part replaced, I relaxed throttle cable to specified slack and the car always had good happy idle on its own.

 

What was the part you replaced

 

Idle control valve.

 

So now battery died alternator shot , replaced now idle speed is 1100 rpm omg