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1.carbon buildup in carburator 2. vacum leak not a sure thing but they are the most likely causes

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1996mazda626lx rough idelling prolems high and low some times cut out?

The rough idling, high and low idle, and stalling issues with your 1996 Mazda 626 LX could be caused by several factors such as a dirty or faulty idle air control valve, a vacuum leak, a malfunctioning throttle position sensor, or a clogged fuel filter. It is recommended to have a professional mechanic diagnose the problem to properly identify and address the issue.


What is a most common cause for rough idle?

Vacuum leak. Could also be the idle air control valve. Read this: http://rds.yahoo.com/_ylt=A0geu5Dx19NHdfsAi8FXNyoA;_ylu=X3oDMTE5MWc1cmxhBHNlYwNzcgRwb3MDMQRjb2xvA2FjMgR2dGlkA1FSVzJfMTE4BGwDV1Mx/SIG=12ug709tt/EXP=1205152113/**http%3a//www.tomco-inc.com/Catalog/27idle%2520air%2520control%2520motors.pdf


How do you identify the idle time variance?

Idle time variance is calculated by finding the difference between the actual idle time and the standard idle time, then multiplying the result by the standard rate for idle time. The formula is: Idle Time Variance = (Actual Idle Time - Standard Idle Time) x Standard Rate for Idle Time. This variance helps identify whether idle time was more or less than anticipated and its impact on costs.


Your 1992 topaz won't idle when cold after it's been driven for about 5 minutes it is fine you are told you need to replace your idle control sensor does this sound right?

You should have the check engine light come on for this, if it does then check the codes. If the light does not come on, then yes it is possible it is the idle sensor, could be the MAP,( master air flow sensor also ) best, do you have a auto wreckers ( scrap yard ) near you, check for some used parts to confirm the problem. Problem with Ford, most of these parts are yours once you leave the building. No return.


Why would the RPMs fluctuate when stopped at a light in a 2000 Galant?

The RPMs may fluctuate when the car is stopped at a light due to issues with the idle control system, such as a dirty throttle body, faulty idle air control valve, or vacuum leak. It is recommended to have the car inspected by a mechanic to diagnose and properly address the issue.

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