Question about 1998 Pontiac Grand Am

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98 grand am runs rough at low rpms new cat plugs filters wires

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  • ksadecki Jun 27, 2009

    no check eng light on, on highway when go to pass eng flutters till let off gas and re apply

  • ksadecki Jun 27, 2009

    rpm drops every couple min in park with nothing on

  • Marvin
    Marvin May 11, 2010

    do u have a check eng light?



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Before you get carried away changing anything else, run injector cleaner through your tank of gas. I have patiently solved my idle problems several times like that. Consider our injectors are 10 years old now. Clean or change PCV as well. Dale

Posted on Jul 26, 2009


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My car will die if it idles below 1000 rpms sometimes but if you unhook to make it run richer it runs fine for a while. It had a plugged cat and it has been changed it has new wires and plugs, new throttle...

You need to get it hooked up to a scan tool and see what codes it has in it (if any) it could be something as simple as a vacuum leak

If you need further help, reach me via phone at

Nov 19, 2017 | 2001 Pontiac Grand Prix GT

1 Answer

Runs rough at higher rpms

How are the spark plugs, fuel psi, fuel filter, and air filter? If they are all good, check if the maf. sensor and cat. converter are getting plugged. Does the cel. come on?

Sep 16, 2013 | Ford F-250 Cars & Trucks

2 Answers

98 gmc jimm 4x4 4.3l v6 replaced plugs, wires and distributor cap and rotor. Still getting P0304 code and rough idle. Higher rpms flatten out roughness but take off feels off. Any help??

spray carb/choke cleaner all around intake gasket mating surface on heads. (while motor is running) If rpms change you have a bad intake gasket.

Feb 07, 2011 | 1998 GMC Jimmy

1 Answer

Run rough at low speed

Possibly there is to high of a mixture of gasoline going into the cylinder. It might be a computer problem, the dealership/garage with a Tech2 would be able to tell you for sure.

Oct 16, 2009 | 1995 GMC Yukon

1 Answer

Running roug at low idle, smooths out at 2500 rpms

change plug and wire if its been a while most cars have 90000 miles platinum plugs in them.but the wires wear before change plugs and wires.+clean fuel injectors .change fuel filter and air filter.if car still run rough your idling to low.have idling check .

Jun 06, 2009 | 2001 Oldsmobile Alero

1 Answer

Truck stalls

if it is burning rich, there for it will be over fueling around low rpm i do belive, which will cause the engine to flood, im guessing after you have been low rpm then go for high rpms, it like hesitaes and takes abit of a cough then goes, if that is the case then it is overfueling.

there is a way to advance/****** the engine mixture, but id say for safe if you don't know what your doing to take it do a garage, and ask for it to be timed up with the timing strobe light :) which will stop the, over fuelling around low rpms.

Apr 10, 2009 | 1994 Toyota Pickup

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