rough idling

Asked by Copenhagenlover Jan 17, 2016 at 09:39 AM about the 1998 GMC Sierra 1500 C1500 SL Extended Cab SB

Question type: Maintenance & Repair

why does my 98 Sierra idle rough between
1st and 2nd gear,? it's 2wd runs good once
it gets out of 2nd,gears switch right on with
the rpms at 2,500. what could our be.?

3 Answers
221,085

Rowefast answered 8 years ago

Sounds like it may need a tune-up and a going over.

1 people found this helpful.
Mark helpful

Copenhagenlover answered 8 years ago

I had someone say a blown head gasket but it hasn't smoked not once, the water isn't milky or anything that shows a blown gasket so I was just wondering. It has a new oil filter on it also.

Mark helpful
221,085

Rowefast answered 8 years ago

No indication of a blown head gasket as long as there is not white smoke coming out the exhaust like steam, oil not going over full, and oil in the radiator or a overheating problem. So is that a 4.3L in there? They have one specific problem which is fuel. You may want to check fuel pressure at the schrader valve, should be 56 to 63 lbs.

1 people found this helpful.
Mark helpful

Your Answer:

Related Questions

  • rough idling 3 Answers

    why does my 98 Sierra idle rough between 1st and 2nd gear,? it's 2wd runs good once it gets out of 2nd,gears switch right on with the rpms at 2,500. what could our be.?

    1998 GMC Sierra 1500 C1500 SL Extended Cab SB

    -

    Maintenance & Repair

  • Why does it rough idling on startup? 2 Answers

    Weather its cold or warm on startup it idles rough then rpm goes up to 1500 and smoothes out and runs great, idles good after that.

    1995 GMC Sierra 1500 C1500 SLE Extended Cab Stepside SB

    -

    Maintenance & Repair

  • 1990 GMC Sierra idling rough and guzzling coolant. Why? 8 Answers

    Truck has started idling really rough when, say, stopped at a light. The idle continues to be rough when I pick up speed, but it tends to even out a little. On top of that, my coolant has been disap...

    1990 GMC Sierra 1500

    -

    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

  • Engine running kind of rough 1 Answer

    I replaced the intake gasket and ever since then it's been idling rough. The machine says the timing is zeroed out so not too sure what it is? Replaced the fuel filter and all plugs and wires and ...

    1997 GMC Sierra 1500 K1500 SL 4WD Extended Cab LB

    -

    Maintenance & Repair

Sierra 1500

Looking for a Used Sierra 1500 in your area?

CarGurus has 66,245 nationwide Sierra 1500 listings starting at $1,100.

ZIP:

Own this car?

Share your experience with others.

1998 GMC Sierra 1500

Write a car review

Review another car

Shortcuts

Search GMC Sierra 1500 Questions

CarGurus Experts

  • #1
    yetilikesbeer
    Reputation
    12,350
  • #2
    dragonflyoffshore
    Reputation
    11,510
  • #3
    John Saffrahn
    Reputation
    11,450
View All

Know more, shop wisely

Search

Related Models For Sale

Used Chevrolet Silverado 1500
4,148 Great Deals out of 130,279 listings starting at $1,000
Used Ford F-150
6,069 Great Deals out of 132,976 listings starting at $900
Used Chevrolet Silverado 2500HD
1,057 Great Deals out of 30,669 listings starting at $3,800
Used GMC Yukon
657 Great Deals out of 11,537 listings starting at $1,800
Used Toyota Tacoma
1,972 Great Deals out of 33,002 listings starting at $2,990
Used Dodge RAM 1500
82 Great Deals out of 1,606 listings starting at $995
Used Ford F-250 Super Duty
1,335 Great Deals out of 42,492 listings starting at $2,000
Used Chevrolet Tahoe
1,027 Great Deals out of 21,331 listings starting at $1,000

Used Cars for Sale

2024 GMC Sierra 1500 For Sale
100 Great Deals out of 43,976 listings starting at $28,505
2023 GMC Sierra 1500 For Sale
254 Great Deals out of 4,587 listings starting at $31,987
2022 GMC Sierra 1500 For Sale
202 Great Deals out of 1,719 listings starting at $28,410
2021 GMC Sierra 1500 For Sale
302 Great Deals out of 4,063 listings starting at $19,000
2020 GMC Sierra 1500 For Sale
205 Great Deals out of 2,403 listings starting at $17,990

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.