what do i look for when my truck boggs down and the back fires alot.

Asked by Dec 25, 2013 at 05:33 PM about the 1998 GMC Sierra C/K 1500

Question type: Maintenance & Repair

i have a 1998 gmc 1500 5.0 it wouldnt start one day so i changed all the plugs and now it runs in park a little rough. then when i drive it it boggs down and back fires alot. what am i looking for.

3 Answers

well if this was a California or smogger like that would suggest an EGR valve which can get clobbered with carbon...disassemble and clean it with brake cleaner and use a new gasket~ https://www.google.com/#q=1998+GMC+Sierra+C%2FK+1500+egr+gasket

the purpose of this device is to COOL the combustion temps during HARD acceleration (we don't want the motor to melt) and to reduce emissions by diverting the exhaust back into the intake....which we certainly aren't going to HELP performance by doin' this...also the egr valve has a diaphragm and a vacuum source...check both of these things too...while we're at it~


Your Answer

Sierra C/K 1500

Looking for a Used Sierra C/K 1500 in your area?

CarGurus has 2 nationwide Sierra C/K 1500 listings and the tools to find you a great deal.


GMC Sierra C/K 1500 Experts

  • #1
    Andrew Olsen
  • #2
  • #2
    John Saffrahn
View All

Related Models For Sale

Used GMC Sierra 1500
887 Great Deals out of 59,331 listings starting at $1,980
Used Chevrolet Silverado 1500
2,199 Great Deals out of 151,084 listings starting at $1,499
Used Ford F-150
2,558 Great Deals out of 220,223 listings starting at $1,222
Used GMC Sierra
28 listings
Used Chevrolet C/K 1500
738 listings starting at $2,995
Used Dodge Ram 1500
327 Great Deals out of 9,602 listings starting at $800
Used GMC Yukon
375 Great Deals out of 18,852 listings starting at $2,500
Used GMC Sierra Classic 1500
15 Great Deals out of 281 listings starting at $3,163
Used GMC Sierra 2500
148 listings starting at $4,700
Used Chevrolet S-10
7 Great Deals out of 998 listings starting at $999

Used Cars For Sale

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.