Question about MagnaFlow 2000 Dodge Ram - 3500, 8.0L V10, to 15000 GVW, with federal emissions system - Catalytic Converters

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Rpms fluctuates while idling what could be wrong with it

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Sounds like a vacuum leak check vacuum hoses including PB hose

Posted on May 05, 2015

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Rough idling 2000 carbureted heritage classic


It sounds as if you may have some partially contaminated fuel entering the carbs. About the only other thing I can imagine that would cause this is a very small vacuum leak at the point where the carbs mount. Carbs have even been known to shake loose at the air horn to main body gasket. Good luck!

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My car idles roughly and jerks. The rpms fluctuate and the lights flicker when it jerks and shakes. I just had someone change the spark plugs, could they not have done it right?


Yes, first it shouldnt take an hour to do spark plugs, also there may be an HT lead loose, but most likely incorrect plugs, wrong gap or worse, a cracked plug if they did them up too tight. I would remove them and check everything asap as it will be putting stress on your coil/coils.

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I have a 1998 GMC Sierra, 5.7 liter Vortec 4x4. It has 160k miles. I have noticed that it idles at around 500 rpms when its warmed up. Not sure if this is normal. However, I have noticed a bit more...


The normal idle for your engine should be 550 to 600 RPMS so thats not to far off . But the fluctuation is more likely the crank pisition sensor then the EGR valve this engine has a condution called crankshaft wip witch is normal but going down a rough road can somethimes set off a misfire code It wouldn't be a bad idea to take the EGR valve off and clean it and check it but the CPK would give you the fluctuation in RPMS . It still could be a few outer things but this it the most likely cause

Apr 02, 2011 | 1998 GMC Sierra

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Error Code reported IAC part, AZ suggested to take off the part and clean out the carbon, They cleared code and we cleaned part. No code this time but the rpms continue to fluctuate while driving the...


What was it doing before? was the idle fluctuating before you cleaned the iac. If so then you probably need to replace the sensor. what did you use to clean the sensor? Some IAC's are sensitive and cannot be cleaned without damaging them.

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Engine revving problem


Sounds like your idle speed is way too high, should be somewhere around 800-1200 rpms. I would check for vacuum leaks.

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