I have a 2001 ford f150 that idles up and down.....going down the rd it runs fine but if you come to a stop, it sometimez will idle up high enough to jump the truck forward or it will idle really low and cut off.....does the same in neutral....just replacedthe throttle control valve and still didn't fix the problem? Any ideas?

Long High idle after start up - YotaTech Forums

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Dec 20, 2011 - aviator's Avatar ... When the high idle is no longer needed the piston retracts and the throttle ... Sometimes the piston gets gunky and slow to react... clean the ... you are already idling higher then normal the idle up will only be worse... for ... it takes to kick down when I first start it up, high idle is at 2200 RPM it ...Missing: lincoln

High idle at start up - F150online Forums

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Oct 27, 2007 - ... King Ranch · Lightning · Lincoln Blackwood & Mark LT · SuperCrew · SVT ... my 2000 when its been sitting goes up close to 2k then drops down in seconds. ... so what your saying is when it's cold outside I can expect it to start andidle at 2200 rpm. sounds pretty off to me. ... Vehicle: 2004 Ford F150 5.4L. 4.6l Intermittent High Idle. Why?
Jul 12, 2005
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Jun 29, 2001
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To be honest no idea with my head under the bonnet and having a play to see whats wrong ,could be anything from a vacumn pipe to faulty sensor .

Probably need to rebuild the carb.

You may have a sludged up throttle valve and air bypass idle speed control valve, do the following to correct that.

I want you to get a can of intake cleaner from any local parts store, not carb spray, intake cleaner, it is made by a company called CRC, remove the air intake hose to the engine, hold the idle high so the engine won't stall, then spray the can of cleaner into the intake while keeping the engine running, use at least 1/2 the can, shut down the engine and disconnect the battery for 5 minutes, then restart and complete a number of mixed driving cycles, town, freeway, stop and go etc., after a few days the problem will go away as the system will relearn to the clean intake.

Those Fords Have Problems With The IAC(Idle Air Control Valve) On Top Of Intake By Throttle Body. It Might Even Be Making Some Weird Noises? If Not Check Timing, And Fuel Preasure.....Check For Vacumme Leaks. Good Luck

the idle controls could be the problem

with the engine running lift hood and lisen for a vacum leak and check all your vacum lines. if no vacum leak can be found then replace the idle air control valve.

Check all of your vacume lines. If it isn't a vacume line it is most likely the O2 sensor.

if it isnt the iac probably the pcv valve positive crankcase vent. it is on a vacuum line somewere under hood. or check the air cleaner, the hose with the small filter underneath the air filter. i take its fuel injected?

if it has a converter on it.....it may be stopped up, but before you replace it have the fuel pump checked, as it may not be getting enough gas at higher rpms. It will start and idle fine, but starve out when you press the pedal. Have you changed the fuel filter?That will cause the same problem.....