Question about 1985 Chevrolet Chevy

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Rough idle at higher rpm smooth

Rough idle at higher rpm smooth

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You have a vacume leak somewhere. You can try to listen for it or you can get a can of brake parts cleaner and spray it around the engine. Anywhere there is hoses or connections of any kind. When you find the leak the engine RPM's will increase. If thats not the problem it could be your EGR valve is clogged or your map sensor could be bad. Those things would usually cause a check engine light. Vacume leaks wont. Good luck

Posted on Jun 19, 2009

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Posted on Jan 02, 2017

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SOURCE: My 1973 ford f100 will idle rough at lower rpm's

This can be a vacuujm leak or a cylinder missing.

Posted on Aug 10, 2011

  • 691 Answers

SOURCE: 3500 silverado 5.7 runs idles

The age of your vehicle guarantee's a vacuum leak. It may sound silly but the truth is rubber grommets and hose's shrink and dry out over time and the harsh environment under the hood makes it worse. Check all vacuum lines and fittings attached to the intake manifold, valve covers(pcv valve), and be sure to check for a vacuum fitting on top of the intake just behind the throttle body. Does it fit tight in the hole? You can seal loose fittings with a high-temp RTV (Red) silicone sealant/adhesive. Several small leaks add up and your engine, heat/AC, will be all to glad to tell you about it.

Posted on Aug 25, 2011

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7.5 l engine. Starts well but idles a bit roughly. Check engine light illuminates intermittently but does not stay lit constantly. Thanks!


If you have a check engine light the best thing is to read the codes and find out what the problem is. Many shops like Aamco read codes free.

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My 99 454 3500 chevy ou runs rough at idle but runs fine at higher rpm:s


wow a 99 an oldie but a goodie , one that old id be looking at all the vac lines , for pin holes,worn spots and cracks , a vac leak will make engne run rough at idle and as you acclerate the vac goes away so hole in hose does not matter

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My 1999 454 idles rough but runs fine at higher rpm's What is the problem?


Possibly wrong plugs,incorrect timing. My 94 5.7 TBI ran rough and found that the spark plugs were incorrect for my engine settings.

Sep 11, 2014 | Cars & Trucks

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1992 rough idle


Could be anything. Vacuum, valves, rings, tune up. Check vacuum lines. Then check compression before you do a tune up. If you have bad compression in a cylinder, tuneups don't help. In that case, either drive it till it dies or replace/rebuild the engine.

Aug 31, 2014 | 1992 Nissan Pickup

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1986 F2 5460 v8 runs good at higher rpm's runs rough when idling what can I do


Have you checked for air leaks in the intake after the air box

Jul 23, 2013 | Cars & Trucks

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I have a 95 mustang v6 that I got as a project. It had blown was gasket and ran rough at idle with lack of power. I redid heads and gaskets etc it runs great and has good power but still idles rough at...


Idling is too slow at 500 rpm.......think about at least 650 rpm to charge the battery and keep up inertia for better take-off power.
Find out how to increase rpm,whether it's a screw-stop adjustment or a timing problem. don-ohio (:^)

Jun 12, 2013 | Cars & Trucks

1 Answer

My 1973 ford f100 will idle rough at lower rpm's


This can be a vacuujm leak or a cylinder missing.

Aug 10, 2011 | 1981 Ford F 100

1 Answer

I have a 1994 Honda Accord 4 door v6. I have rough idle when in drive and smooth idle when in neutral. Also rough take offs from a stop or slow speeds. If I pump the gas pedal a few time the rough take...


  • does the engine miss? bumps is a rythmic pattern?
  • an engine miss will appear to diminish at higher rpm due to centrifical force.
  • other possible problem broken or flat motor mount.
  • is the idle rough in reverse?
  • if not
  • open hood
  • start engine
  • Left foot on brake (hard)
  • start engine
  • watch engine as you select drive
  • still holding brake with left foot / throttle gas with right foot
  • does engine dramatically move?
  • if so replace motor mount on offending side
  • if not possible engine miss or transmission problems

Jul 10, 2010 | 1994 Honda Accord

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