rough idling

Asked by 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

37,955

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

1 out of 1 people think this is helpful.

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.

37,955

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 out of 1 people think this is helpful.

Your Answer

Add photo

Related Questions

  • 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 in cold weather 9 answers

    In cold weather my 2000 sierra starts, reves up idles back down to rough idle and continues to do so for about a minute. Once it warms up runs great and does not do this in warm weather. Have had seve...

    2000 GMC Sierra 1500 SL Standard Cab SB

    -

    Maintenance & Repair

  • Engine Missing Rough Idle? 3 answers

    I've got a '98 GMC Sierra 1500c 5.7 liter. The engine is missing at 50- 60 mph goes away at 70mph. It happens mainly when its hot or its been running for a while. It has also started to idle a ...

    1998 GMC Sierra 1500 C1500 SLE Extended Cab LB

    -

    Maintenance & Repair

  • Rough Idle/No start 5 answers

    Okay guys, so my truck has been sitting since May of this year, and it broke down while I was driving about 200 miles from home. So obviously, it was running well and I didn't think there were any ...

    1996 GMC Sierra 1500 C1500 SL Standard Cab LB

    -

    Maintenance & Repair

  • idle rough 3 answers

    my truck is idling really rough it dosent seem bad when im driving but when i come to a stop it shakes really bad , or when i first start it , what can it be ??

    1998 GMC Sierra 2500 2 Dr K2500 SLE 4WD Extended Cab LB HD

    -

    Maintenance & Repair

Sierra 1500

Looking for a Used Sierra 1500 in your area?

CarGurus has 56,548 nationwide Sierra 1500 listings starting at $1,600.

ZIP:

Search GMC Sierra 1500 Questions

GMC Sierra 1500 Experts

#1 dragonflyoffshore
dragonflyoffshore
Reputation 4,500
#2 John Saffrahn
John Saffrahn
Reputation 3,150
#3 Glenn Clingenpeel
Glenn Clingenpeel
Reputation 2,740
View All

Related Models For Sale

Used Chevrolet Silverado 1500
2,472 Great Deals out of 145,720 listings starting at $1,800
Used Ford F-150
3,132 Great Deals out of 200,437 listings starting at $1,273
Used Dodge Ram 1500
485 Great Deals out of 11,746 listings starting at $1,795
Used Toyota Tacoma
713 Great Deals out of 32,026 listings starting at $2,995
Used GMC Yukon
498 Great Deals out of 16,962 listings starting at $1,777
Used Chevrolet Tahoe
996 Great Deals out of 30,891 listings starting at $1,495
Used Ford F-250 Super Duty
450 Great Deals out of 41,606 listings starting at $2,850
Used Chevrolet Camaro
621 Great Deals out of 38,657 listings starting at $2,995
Used GMC Sierra 2500
3 Great Deals out of 168 listings starting at $7,995

Used Cars For Sale

2017 GMC Sierra 1500 For Sale
5 Great Deals out of 27,346 listings starting at $23,800
2016 GMC Sierra 1500 For Sale
81 Great Deals out of 7,186 listings starting at $19,400
2015 GMC Sierra 1500 For Sale
188 Great Deals out of 4,514 listings starting at $15,999
2014 GMC Sierra 1500 For Sale
179 Great Deals out of 4,391 listings starting at $14,971
2013 GMC Sierra 1500 For Sale
134 Great Deals out of 2,544 listings starting at $10,995