Why is my 1990 GMC 5.0 motor backfiring it's a throttlebody

Asked by Aug 26, 2014 at 08:57 AM about the 1990 GMC Sierra 1500

Question type: Maintenance & Repair

It runs fine for a while and then when
we're out on the highway it starts
cutting out and acting like it's going
to die or get no gas and it backfires

3 Answers

70,285

Could be fuel pump going bad,or may all so be igintion control module going bad.

I've changed the fuel pump twice, it still same. It's hard to start backfires, seeme like no gas to the carberstor.

I'm pretty sure it is the fuel line filter right under the driver side door. Please let me know if you try this and if that was a fix or not. Thank you.

Your Answer

Sierra 1500

Looking for a Used Sierra 1500 in your area?

CarGurus has 64,898 nationwide Sierra 1500 listings starting at $999.

ZIP:

GMC Sierra 1500 Experts

  • #1
    dragonflyoffshore
    Reputation
    5,460
  • #2
    John Saffrahn
    Reputation
    3,780
  • #3
    Glenn Clingenpeel
    Reputation
    3,470
View All

Related Models For Sale

Used Ford F-150
3,297 Great Deals out of 224,480 listings starting at $1,200
Used Chevrolet Camaro
443 Great Deals out of 31,893 listings starting at $1,450

Used Cars For Sale

2018 GMC Sierra 1500 For Sale
3 Great Deals out of 26,504 listings starting at $23,419
2017 GMC Sierra 1500 For Sale
86 Great Deals out of 10,675 listings starting at $20,369
2016 GMC Sierra 1500 For Sale
175 Great Deals out of 4,105 listings starting at $16,404
2015 GMC Sierra 1500 For Sale
192 Great Deals out of 5,659 listings starting at $14,995
2014 GMC Sierra 1500 For Sale
221 Great Deals out of 5,002 listings starting at $9,900

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.