Question about 1991 Nissan Pickup

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When appling the brake truck engine idles rough and when brake is released truck runs smooth

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Try checking the vaccum could be a bad brake booster

Posted on Oct 10, 2010

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1 Answer

Have 3.0 24 valve engine has intermitten rough Idle and during driving at excelleration


What are the trouble codes set? Get them read for free at most auto parts stores.

Dec 10, 2014 | Cars & Trucks

1 Answer

I have a 2006 GMC Envoy, idles rough at a stop when in gear, but levels out smooth when in neutral. Drives smooth on the highway.


check for a vacuum leak in the brake booster. Check this by just allowing the engine to idle with the hand brake on and if ok then put your foot on the brake and if the idle changes then there is an air leak in the booster.

Jul 27, 2014 | Cars & Trucks

1 Answer

Idle good when cold, hotter it gets the worst it idles especially when sitting at stop lights


simple test for a vacuum brake booster
star and run the engine at idle without applying the foot brake
if it gets worse when the foot brake is applied , it is a vacuum leak in the booster ( replace the booster )
otherwise check for failed vacuum hoses including under dash control lines , vacuum leak at the manifold or EGR unit

Apr 16, 2017 | Chevrolet Astro Cars & Trucks

1 Answer

2000 gran prix 3.1 runs fine while driving, but when stopped at a light starts to idle rough


Take the EGR Valve off and clean all the carbon out of it using something to scrape with and use a non-chlorinated brake cleaner.Whenever an EGR Valve gets stuck in the open position it allows exhast gasses into the intake manifold causing the engine to idle really rough,but after you get up to say 45-55 its smooths out thats when the valve should be open.

Apr 19, 2011 | 1999 Pontiac Grand Prix

3 Answers

My 91 oldsmobile 98 runs rough in idle but when driving run smooth.


Rough idle is a very common problem on 4 cylinders, but I believe the 98 Regency has a 6 cylinder in it, right?

Sometimes the coil packs get iffy, and sometimes the EGR Valve gets a leak in it causing a rough idle.

When the accelerator pedal is depressed, it can change things so that the engine seems to run smoothly.

However, I would look for codes to see if anything intermittent is occurring in the engine that may need attention.

The OBD-I scanner can help to diagnose the problem, if anything is out of specifications on the engine in question.

The owner will have to find a technician that has such a scanner.

Aug 29, 2010 | 1991 Oldsmobile Ninety Eight Regency

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

1 Answer

Rough idle at higher rpm smooth


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

Jun 19, 2009 | 1985 Chevrolet Chevy

1 Answer

V6 engine idles rough after restarting, then smooths out


My first guess would be a dirty carb/fuel injector set. Run some fuel cleaner through the tank and see if it gets better. You might have to do it through a couple of tanksful. How long since you've had a tune-up? It might just be that time.

Nov 15, 2008 | 1993 Toyota Pickup

1 Answer

Fuel system


Check the fuel system, chenge fuel filter. clean the fuel tank.

Oct 16, 2008 | 1994 Toyota T100

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