Many reasons are possible such as needs tune up bad gas idle control needs attention o2 sensors --cat converter - exhaust restriction -fuel delivery are just a few --have vehicle for any codes
The check engine light should be on go to autozone for a free code reading to find out what's happening if you don't see light on the bulb may be burned out
SOURCE: Our 2001 ford focus when it idles it surges
Check the pcv hose for leaks at the intake manifold. Common problem.
SOURCE: rough idle and stalling 2003 ford taurus ses
mine did the same it was the map censor had new one installed about 125$
SOURCE: 2009 Ford Focus wont go passed 350 rpms and seems like it might stall
The
following are the general instructions on the start of diagnosing any
electronically controlled engine or transmission problem. The
engine and the automatic transmission (transmission control is only
for automatics, engine is still computer controlled no matter the
transmission type) in this vehicle are computer controlled and in
most cases when a fault occurs a fault code is stored in the memory
of the computer control module. There are exception to this, such as
the Mass Airflow Meter and fuel pressure problems. What must be done
is to have all the basic testing done such as a scan of the system
for fault codes as well as a check with a live data scanner tool for
engine functions that are not within range of normal, a trained
technician is required to know what is correct and what isn't, then
based on careful diagnostics done from a factory repair manual the
correct part is replaced or the wiring repaired or the computer
replaced (known as the PCM), which is very rarely the problem. Other
basic checks must be done as well such as mechanical problems with
the engine as well as engine state of tune and mileage on the engine.
The transmission can have mechanical issues as well such as no gear
engagement at all or a failed pump or other pressure related
problems. Also engine mechanical problems ca cause many
drive-ability related problem such as rough idle and other symptoms
SOURCE: 2009 Ford Focus 1.8 engine nearly stalls when coming to a stop rough idle
Coming to a stop from what speeds. Ford is known for iac valves. Rough idle is only a cause from lack of air or miss fires. I would start by checking your spark plugs(dont just replace them) see if any are fouling out. . It's a start. The nearly stall is the biggie. Easy check on vacuum leaks use soapy water and take the opportunity to clean your motor;) good luck keep me posted should be an easy fix
The
following are the general instructions on the start of diagnosing any
electronically controlled engine or transmission problem.
The
engine and the automatic transmission (transmission control is only
for automatics, engine is still computer controlled no matter the
transmission type) in this vehicle are computer controlled and in
most cases when a fault occurs a fault code is stored in the memory
of the computer control module. There are exception to this, such as
the Mass Airflow Meter and fuel pressure problems. What must be done
is to have all the basic testing done such as a scan of the system
for fault codes as well as a check with a live data scanner tool for
engine functions that are not within range of normal, a trained
technician is required to know what is correct and what isn't, then
based on careful diagnostics done from a factory repair manual the
correct part is replaced or the wiring repaired or the computer
replaced (known as the PCM), which is very rarely the problem. Other
basic checks must be done as well such as mechanical problems with
the engine as well as engine state of tune and mileage on the engine.
The transmission can have mechanical issues as well such as no gear
engagement at all or a failed pump or other pressure related
problems. Also engine mechanical problems ca cause many
drive-ability related problem such as rough idle and other symptoms
http://technoanswers.blogspot.in/2012/02/nissan-pathfinder-stalls-and-bucks-on.html
-----------
Nissan Pathfinder Backfires?
http://technoanswers.blogspot.in/2012/02/nissan-pathfinder-backfires.html
---------How to adjust rpm?
http://schematicsdiagram.blogspot.com/2011/12/how-to-adjust-rpm-on-2009-dodge-charger.html
------------Engine cuts out at 3000
RPM?
http://schematicsdiagram.blogspot.com/2011/12/engine-cuts-out-at-3000-rpm.html
----------This will help.Thanks.
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