Checked the fuel pump ok checked spark plugs ok checked the egr ok checked spark pug wires ok.
At hi mileage,you may want to clean the throttle body(if there is carbon buildup,the computer can't compensate for it because the idle position required to avoid stalling won't be consistent).I was also wondering if this is a "drive by wire"setup-no throttle cable.If so,you may have an issue with the stepper motor in the throttle body.(this design hadn't come out yet when I quit working on cars for a living in 97,so this is just a guess)
SOURCE: rough running, erratic spark
Run a compression test on the cylinders.If reading is low on any drop a little engine oil into the pot. If compression rises you have compession ring problems. Remove all plugs before you try this and place leads away from engine.
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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SOURCE: My check engine light keeps coming on. With a
check for a loose ecm ground, also try swoping ecm with another, to see if the unit is faulty.
SOURCE: MY Ford F-150 cranks but will not start. Check
Are you sure the spark is sufficient? I have seen weak coils cause your problem also bad coil wires loosing to much voltage to the distributor.
SOURCE: car died while driving checked fuel pump ok and
The spark is to weak change the crank sensor.If that does not solve the problem then its the coil pack that needs to be replaced
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