Rough idle and bubbling noise under cab

Asked by jarrodtysonchav88 Jan 19, 2017 at 11:34 PM about the 1991 GMC Sierra 1500 C1500 SLE Extended Cab LB

Question type: Maintenance & Repair

I have a 91 GMC Sierra 1500 5.0 .  It idles
rough at low speed sometimes  stalling .
Runs  fine  at a higher speed .  There's also
a bubbling noise under the cab  like it's
coming from the muffler . But the noise
doesn't always happen .  I have changed
the idle  control valve PCV valve and  fuel
filter .

2 Answers

F_O_R answered 7 years ago

Maybe you have a exhaust leak. Take it to a muffler shop. The rough idle could mean you need a tuneup or that the IAC is dirty or needs replacing.

Mark helpful

Your Answer:

Related Questions

  • Rough idle and bubbling noise under cab 2 Answers

    I have a 91 GMC Sierra 1500 5.0 . It idles rough at low speed sometimes stalling . Runs fine at a higher speed . There's also a bubbling noise under the cab like it's coming from the muffler...

    1991 GMC Sierra 1500 C1500 SLE Extended Cab LB

    -

    Maintenance & Repair

  • Rough idle 12 Answers

    Rough idle won't stay running have change elec.spark control, idle air control,plugs,map sensor,tps, and the ecm.. Still running rough but if you unscrew the IAC it idles high but the miss smooths...

    1991 GMC Sierra 1500 C1500 SLE Extended Cab LB

    -

    Maintenance & Repair

  • Rough idle 1 Answer

    Idle is very rough. If you blow it out carbon pours out of the exhaust. But it starts idling rough again.

    2005 GMC Sierra 1500

    -

    Maintenance & Repair

  • Rough Idle at lights and stop signs 2 Answers

    I replaced my 2000 GMC Sierra 1500 (V8) TPS sensor because of rough idle, did not solve the problem, so I replaced the Idle Air Control Valve, and that didn't fix it either. I have tried resetting t...

    2000 GMC Sierra 1500 SLE 4WD Extended Cab SB

    -

    Maintenance & Repair

  • Rough idle 2 Answers

    Hi I have a 2006 GMC Sierra 5.3 170k and recently about the past 1000 miles my idle has been getting worse but today I noticed when I put the ac on it seems to smooth out again any thoughts?

    2006 GMC Sierra 1500 SLT Extended Cab 6.5 ft. RWD

    -

    Maintenance & Repair

Shortcuts

Search GMC Sierra 1500 Questions

CarGurus Experts

  • #1
    yetilikesbeer
    Reputation
    12,810
  • #2
    dragonflyoffshore
    Reputation
    11,740
  • #3
    John Saffrahn
    Reputation
    11,690
View All

Find great deals from top-rated dealers

Search

Related Models For Sale

Used Ford F-150
307 Great Deals out of 15,379 listings starting at $1,954
Used GMC Yukon
22 Great Deals out of 725 listings starting at $5,998

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use. Content will be removed if CarGurus becomes aware that it violates our policies.