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

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  • Cars & Trucks Expert
  • 259 Answers

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

Posted on Jul 26, 2013

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Posted on Jan 02, 2017

  • 1 Answer

SOURCE: Rough idle and engine will shut off after warm.

Check the exhaust manifold gasket. I have a 2003 SVT Focus I had a problem with it loping at low RPMs. I had a free flow exhaust system. When I bought a new exhaust manifold I replaced the gasket and the problem went away.

Posted on Apr 08, 2009

Deutsche
  • 17 Answers

SOURCE: 1991 VW Cabriolet runs rough during idle

Check the hose between the inletmanifold and the pipe to the brakeservo it normally gets old and a crack in so the engine sucks false air on cylinder 4, causing engine to run rough or uneven.

Posted on Apr 14, 2009

  • 105 Answers

SOURCE: Engine idles rough and even misses. At higher rpm

Bingo it sounds very much like a vacuum leak

Posted on Mar 17, 2009

  • 115 Answers

SOURCE: Rough idle stalls and some times engine dies.P0300

a car that idles rough and clears up is the sure sign of an o2 sensor shorted this may not give a code if the short in the sensor is bad the computer will eliminate its input to protect itself

Posted on Sep 03, 2009

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

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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.

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1987 Chevy 1 ton 350 V8 After a little while of idle (Perfectly) It'll rev its self up all by it's self and Idle at a higher Rpm


check for leak at base of carby. It sounds like the idle mixture is leaning out. check for corrosion at gaskets or loose carby body

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i was told that some rangers have a govner or sensor that won't allow you to go over 3,ooo rmp at a idle,it will make it run rough and backfire,it' to keep you from blowing up your motor

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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

1991 VW Cabriolet runs rough during idle


Check the hose between the inletmanifold and the pipe to the brakeservo it normally gets old and a crack in so the engine sucks false air on cylinder 4, causing engine to run rough or uneven.

Mar 01, 2009 | 1991 Volkswagen Cabriolet

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1997 jeep grand cherokee... missfires... idles rough when stoped.


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