Truck fuel problem

Asked by Jun 16, 2017 at 11:49 PM about the 1999 GMC Sierra 1500 SLT 4WD Extended Cab LB

Question type: General

Replaced fuel pump cut cats put straight
pipe plugs wires distributior cap roter now it
cranks but idle is reving up and down up and
down please help

2 Answers

Could it be fuel pressure regulator

68,895

Dont think it,s regulator,being cats are off it may be causing the ecm to not know the fuel air mixture and has to purge fuel/meaning dump at idle,try unhooking the throttle position sensor and running it.

Your Answer

GMC Sierra 1500 Experts

  • #1
    dragonflyoffshore
    Reputation
    5,390
  • #2
    John Saffrahn
    Reputation
    3,740
  • #3
    Glenn Clingenpeel
    Reputation
    3,430
View All

Related Models For Sale

Used Chevrolet Silverado 1500
2,217 Great Deals out of 167,673 listings starting at $1,000
Used Ford F-150
2,485 Great Deals out of 193,508 listings starting at $799
Used Toyota Tundra
470 Great Deals out of 33,100 listings starting at $2,900
Used Dodge Ram 1500
360 Great Deals out of 10,776 listings starting at $1,500
Used Toyota Tacoma
566 Great Deals out of 43,788 listings starting at $2,200
Used GMC Yukon
428 Great Deals out of 22,353 listings starting at $1,995
Used Ford F-250 Super Duty
315 Great Deals out of 45,034 listings starting at $1,700
Used Chevrolet Tahoe
695 Great Deals out of 41,238 listings starting at $1,995
Used Chevrolet Camaro
395 Great Deals out of 30,566 listings starting at $2,495
Used Ford Mustang
590 Great Deals out of 36,167 listings starting at $1,800

Used Cars For Sale

2017 GMC Sierra 1500 For Sale
83 Great Deals out of 23,341 listings starting at $23,378
2016 GMC Sierra 1500 For Sale
139 Great Deals out of 4,066 listings starting at $16,990
2015 GMC Sierra 1500 For Sale
156 Great Deals out of 5,197 listings starting at $16,900
2014 GMC Sierra 1500 For Sale
167 Great Deals out of 5,010 listings starting at $13,900
2013 GMC Sierra 1500 For Sale
70 Great Deals out of 2,114 listings starting at $8,450

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.