My idle was too high, got it fixed now the car dies at a light if the heat or air is on.

SOURCE: 2001 FORD F150 ENGINE SURGES AND DIES AT IDLE

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

SOURCE: ENGINE SURGES AT IDLE

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.

Marvin

• 85242 Answers
• Posted on May 10, 2009

SOURCE: ford truck f250 v8 motor idles high

the vacuum leak that causes this high idle is the gasket at the bottom of the upper intake manifold runners, they **** in, done 100's. to confirm this just spray carb cleaner at inside and outside base, when u hit the leak you will hear it. see photo.

SOURCE: engine idles high for a little over a minite then dies

Clean your MAF sensor and see if that works.

SOURCE: My 2002 Ford Taurus will shutter and die when

the idle air control valve is responsible for engine idle.
this is a common failure on ford's. but I don't think yours is bad because it does idle high befor it dies.
you stated you had codes p0171 and p0174 these are lean codes for bank one and two, you said you found a vacuum leak and repaired it, the vacuum leak was mostly likely the cause of the lean codes, however the pcm has calibrated the fueling stategy for this lean mixture, what you need to do is erase the KAM "keep alive memory" this is done by unhooking the negative battery cable for 60 seconds, this is the only way to erase the KAM the $6000.00 machine I use wont even do it.

once the KAM is clean the computer will go into a relearn state and all operating values will be adjusted for the vehicles current condition, during this relearn session the vehicle may have some driveability issues (low or high idle, stalling, poor fuel economy) the relearn should complete within 10 minutes of idling and then 10 minutes of driving.

good luck and keep me updated

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