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I have a 1994 mustang gt 5 speed, Motor runs rough and idle changes motor seems to stumble when at idle

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I would check the ends of all those little rubber vacuum hoses that are used for pollution control. They tend to go hard and /or split where they connect to the metal piping if they are over 10 years old, allowing air / vacuum leaks into the inlet manifold which upsets the idle mixture causing rough / uneven idling. If the hose is long enough you could trim about 1/2 inch off the end and reattach, but if the hose is hard and brittle the best option is to replace any suspect hoses completely. Most auto parts retailers sell the hoses cut to any length you need.

Posted on Jan 05, 2011

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Posted on Jan 02, 2017

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With the motor running and the hood open, try pulling a plug wire off one at a time. When you notice no change or stumble in the motor after pulling a wire off, then that would be the cylinder where your problem is.

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Car wont idle


There re few possibilities that can cause no idle issues.To troubleshoot the issue help links are provided below.Click the link below:---
Idle Problem? http://whatisbyme.blogspot.in/2012/05/2001toyota-corolla-idle-problem.html
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Idles rough and quits when gas pedal is pressed less? http://technoanswers.blogspot.in/2012/01/1999-ford-f-150-idles-rough-and-quits.html-----------
Stumbling and stalling at idle after engine rebuild? http://schematicsdiagram.blogspot.in/2012/03/stumbling-and-stalling-at-idle-after.html

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Rough Idle and Vibration? http://whatisbyme.blogspot.in/2012/05/2006-ford-f150-rough-idle-and-vibration.html

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Steering Wheel Vibrates at Idle? http://whatisbyme.blogspot.in/2012/05/1993-toyota-corolla-steering-wheel.html

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Runs Fine But Idle Is Low? http://whatisbyme.blogspot.in/2012/05/2004-toyota-highlander-runs-fine-but.html

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Vehicle Will not hold Idle? http://whatisbyme.blogspot.in/2012/05/2003-lexus-es300-vehicle-will-not-hold.html

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Engine Idles Rough and Dies? http://whatisbyme.blogspot.in/2012/05/1994-lexus-es300-engine-idles-rough-and.html

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This will help.
Thanks.

Jul 17, 2012 | Cars & Trucks

1 Answer

I bought a second car for utility use; B6000, 1994, p/u, standard trans. Only when starting and running when the engine is cold, it runs very rough and difficult to idle. At normal operating temperatures...


a coolant tempurature sensor will make it run to rich if it is bad. run rough at idle, and produce black smoke, engine may stall out. it also causes retarded timing, slow idle speed, cold hesitation or stumble, poor fuel milage. good-luck!! if light is on check for problem code. this will guide you in the right direction. if no scanner, any auto parts store will scan for free. repost if need be. have a good day!!

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1998 mustang 3.8 engine hards to start cranks forever before starting some hesitation while running


you could ck fuel pressure may be a clogged fuel filter or a fuel pump starting to go.

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Rough Idle when cold runs seems to run ok hot but still almost stalls when you turn on AC and you are at a stop also noticed that the volt meter reads 9v with the AC and the lights on with the AC and...


mcdevito75 here, Sounds like a faulty voltage regulator, it"s 1 unit with the alternator, change the alternator, also the alt. supplies juice to the ignition switch, distributor abd plugs, thus a rough idle due to bad alternator.

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1 Answer

At a steady speed motor skips pulls good on hills seems get worse every day


is this skip like a miss does it run rough at an idle try changing the plugs and wires cap and rotor and see if this helps also run a good fuel system treatment through the vehicles intake and gas tank and clean it out could have a lot of carbon build up in the engine this usually helps with performance issues.

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