1990 GMC Sierra K1500 4x4

Asked by Dec 29, 2015 at 12:41 AM about the 1990 GMC Sierra C/K 1500

Question type: Maintenance & Repair

Started yesterday. It wont start unless you hold the pedal to the floor. It then spits and splutters and rocks for a few seconds until it stabilizes to a regular idol. At times it goes into a high idol. If you hold the brake, and put it in drive or reverse it dies instantly. If you let it idol for a while it runs good, but then if you barely press the gas, again it will die instantly, then not restart. We changed the fuel filter. The wires, distributor, and plugs are good. This just started happening instantly, and didn't act up over time. It has 181,000 miles and just now has had this issue. Regular maintenance has always been done. PLEASE help. Some said it may be the fuel pump, but I don't know.

1 Answer

19,745

Check for vacuum leaks, the line going to your map sensor. Check your codes too. Google "how to check gm obd1 codes"

Your Answer

Shortcuts

GMC Sierra C/K 1500 Experts

  • #1
    Andrew Olsen
    Reputation
    170
  • #2
    enginecreator
    Reputation
    130
  • #2
    John Saffrahn
    Reputation
    130
View All

Related Models For Sale

Used GMC Sierra 1500
232 Great Deals out of 9,989 listings starting at $399
Used Ford F-150
606 Great Deals out of 10,666 listings starting at $3,000
Used GMC Sierra
1 listing
Used Chevrolet Camaro
865 listings starting at $12,000

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.