Question about 2008 Chevrolet Impala

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My 08 Impala LTZ 3.9 has been studdering lately, it gets better when im running over 40mph but under it studders, then when im idling its really bad, I tried putting Gum Out Fuel System Cleaner in hoping the fuel filter was just gummed up, and its a little better but still studdering hard when im going 10mph and lower, any sugestions?

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

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  • 65 Answers

SOURCE: rough idle

Sound like your float is not closing the needle and seat.You might need a rebuild as the fuel when sitting ruins the rubber in the seals.

Posted on Nov 29, 2008

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SOURCE: i have a 1996 oldsmobile cutlass supreme sl 3.4l

the flashing check engine light is indicating a misfire. if you can't get it scanned for codes, start with the obvious, check plugs, wires, and coil packs first.

Posted on Feb 21, 2009

ghost4548
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SOURCE: Santa fe studdering and won't accelerate right? RPM's jump and then steady with continuing studdering?

Engine performance problem causes are many. Try this first.
1. Disconnect the battery cables (both of them)
2. Touch/connect the postive and negative battery cables together for 30 seconds.
3. Reconnect the cables to the battery.
4. Drive vehicle to see if this solved the problem. Let me know what happens.

Posted on May 31, 2009

  • 1 Answer

SOURCE: missin and studdering to take off

chances are it is a bad upper intake seal. It is sucking air and making it code. It cost about 400 to have a mech fix it.

Posted on Jun 16, 2009

  • 40 Answers

SOURCE: 98 5.7 that

Look inside the throttle body with a flashlight. If the intake manifold looks wet or is cleaned off inside, then the SFI fuel injectors are leaking. This will cause poor performance and poor fuel economy. If this is the problem, have the injectors replaced with an upgraded MFI assembly.
Also you did'nt mention spark plugs, check/replace if you have not already.

Posted on Feb 06, 2010

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1 Answer

What causes my 1993 Nissan altima to studder or idle rough at red light or stopped


-It could be miss fire,bad coil, air leak, injector or spark plug and plug wire. It's hard to tell at this moment.
-First able you needed to check all above to determine which part is bad.

Good luck


Mai

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To make a better fix for you, can I get the info about your vehicle? Year/model/engine size?
Thank you.

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1 Answer

Running rough, studders on acceleration, no power.


FIRST, I WOULD TUNE IT UP WITH PLUGS, WIRES CAP AND ROTOR. THEN I WOULD GET SOME REALLY GOOD FUEL INJECTOR CLEANER AND USE AS DIRECTED. MAKE SURE THE TIRES ARE INFLATED TO SPECS AS THIS CAN REDUCE MILEAGE AS WELL. AN INTAKE CLEAN CAN ALSO HELP IT RUN CLEANER AND MORE EFFICIENT. HOPE THIS HELPS. LET ME KNOW. GOOD LUCK

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