1998 GMC Sierra 1500 Low Idle, then dies


Asked by Jun 16, 2017 at 09:36 AM about the 1998 GMC Sierra 1500 C1500 SL Extended Cab SB

Question type: Maintenance & Repair

I drove my GMC Sierra (1998) round trip two days ago about 250 miles,
which is more than usual  As I got off the interstate and was stopping at the
stop sign, I noticed it wanted to idle low and was afraid it was going to die.  I
put it in neutral to keep it revved.  I kept it revved each time I had to slow
down significantly until I arrived at home.  Once at home, I stopped the truck
and it died.  I did notice some oil under the truck, which is the first time I've
noticed it.  After checking the oil, it shows more needed to be added.  I
purchased the high mileage Castrol and put some in yesterday but it
continues to idle low.  Please give me suggestions on what I need to do.  
Thanks in advance.

4 Answers


Which engine is in the vehicle? if it has the 2 injectors on top of the throttle body then one of the injectors could be bad. Or it could just need the throttle body cleaned.


This could be a clogged fuel filter,dirty throttlle body or bad throttle position sensor.


Thanks for the help. I really appreciate it.


After looking it over with a mechanic, we noticed that cylinder 7 was misfiring and the rod is bent.

Your Answer

Sierra 1500

Looking for a Used Sierra 1500 in your area?

CarGurus has 12,093 nationwide Sierra 1500 listings starting at $1,775.

Postal Code:

GMC Sierra 1500 Experts

  • #1
  • #2
    John Saffrahn
  • #3
    Glenn Clingenpeel
View All

Related Models For Sale

Used Chevrolet Silverado 1500
144 Great Deals out of 12,324 listings starting at $1,895
Used Ford F-150
536 Great Deals out of 9,929 listings starting at $3,490
Used Dodge Ram 1500
48 Great Deals out of 476 listings starting at $2,495
Used Toyota Tacoma
30 Great Deals out of 1,322 listings starting at $4,900
Used Chevrolet Tahoe
5 Great Deals out of 912 listings starting at $9,871
Used GMC Yukon
3 Great Deals out of 1,106 listings starting at $6,950
Used Ford F-250 Super Duty
22 Great Deals out of 782 listings starting at $3,500
Used Chevrolet Camaro
1,057 listings starting at $12,995
Used Jeep Grand Cherokee
150 Great Deals out of 4,034 listings starting at $2,400

Used Cars For Sale

2018 GMC Sierra 1500 For Sale
7 Great Deals out of 9,018 listings starting at $3,570
2017 GMC Sierra 1500 For Sale
10 Great Deals out of 803 listings starting at $1,800
2016 GMC Sierra 1500 For Sale
11 Great Deals out of 570 listings starting at $21,495
2015 GMC Sierra 1500 For Sale
36 Great Deals out of 635 listings starting at $19,944
2014 GMC Sierra 1500 For Sale
31 Great Deals out of 355 listings starting at $16,998

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.