Why does it rough idling on startup?

Asked by Mar 03, 2017 at 01:56 PM about the 1995 GMC Sierra 1500 C1500 SLE Extended Cab Stepside SB

Question type: Maintenance & Repair

Weather its  cold or warm on startup it idles rough then rpm goes up to 1500
and smoothes out and runs great, idles good after that.

2 Answers

77,965

I would take out the Idle Air Control Valve, then take the throttle body off and clean the throttle body and the port for the IAC out good. You may even want to replace it unless they can test it at the auto parts store. Same with the EGR Valve, take it off and clean the carbon off and make sure it works. Also just snug up the intake manifold bolts.

Try checking your timing and make sure the distributor is tight

Your Answer

GMC Sierra 1500 Experts

  • #1
    dragonflyoffshore
    Reputation
    5,500
  • #2
    John Saffrahn
    Reputation
    3,780
  • #3
    Glenn Clingenpeel
    Reputation
    3,500
View All

Related Models For Sale

Used Ford F-150
651 Great Deals out of 8,947 listings starting at $1,500
Used Chevrolet Tahoe
6 Great Deals out of 822 listings starting at $4,200
Used Dodge Ram 1500
43 Great Deals out of 462 listings starting at $3,488
Used Toyota Tacoma
37 Great Deals out of 1,216 listings starting at $4,444
Used GMC Yukon
867 listings starting at $4,995
Used Chevrolet Camaro
928 listings starting at $12,498

Used Cars For Sale

2018 GMC Sierra 1500 For Sale
8,242 listings starting at $3,810
2017 GMC Sierra 1500 For Sale
19 Great Deals out of 689 listings starting at $1,800
2016 GMC Sierra 1500 For Sale
19 Great Deals out of 285 listings starting at $20,988
2015 GMC Sierra 1500 For Sale
68 Great Deals out of 522 listings starting at $19,995
2014 GMC Sierra 1500 For Sale
45 Great Deals out of 410 listings starting at $16,291

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.