My GMC 1500 Sierra

Asked by Sep 10, 2016 at 04:09 PM about the 1998 GMC Sierra 1500

Question type: Maintenance & Repair

Help !! I have a 1998 GMC Sierra 1500 I have done
everything I can possibly do by changing anything I
can possibly change and it's still misfiring and it is
running so bad is there any suggestions anybody
can get me I would so appreciate it

13 Answers

78,195

Vortec "spyder" injection system is not the best, you may finally have to replace the system, Have you tried run some SeaFoam in the fuel? See pic.

Doesn't have a Spyder

78,195

96, 97, 98, 99 That is what it is suppose to have. Has it been modified?

It's a 98

It's throttle body injected

78,195

So that would make it an 88 they were TBI. So then have you got the codes out of yet?

Yes it came up missfire

78,195

Random multiple, or did it give you a cylinder number?

I just bought a cam shafts positioning sensor I'm going to see if that works if not I don't know what to do LOL

78,195

Did you check for a bad intake manifold gasket?

No I will but would that cause misfiring? I mean I'm going to pull my hair out I've done all I can think of

78,195

Yes especially if it is leaking internally in the engine valley.

56,775

Have you done a compression test? Checked the ignition timing? Checked the ignition coil? If it is an '88 model it's OBD I and won't give misfire codes. Is the check engine or service engine soon light on? If so, what trouble code(s) do you have? Have you done a tune up? Distributor cap, distributor rotor, spark plugs, and spark plug wires? Does it run poorly all the time? Or only when hot? Only when cold? Only when damp/raining/high humidity? HTH. -Jim

Your Answer

Add photo

Related Questions

  • GMC Sierra 1500 column swap.

    I have a 95 GMC Sierra 1500 that needs a replacement column. I am going to purchase one from a 1997 GMC Sierra k1500. Will the wiring harness be the same? If not, what are my options

    1995 GMC Sierra 1500

    -

    Maintenance & Repair

  • code 24 1989 gmc 1500 sierra 1 answer

    I have a code of 24 on a 1989 GMC 1500 Sierra. Any good ideas on where to look. I have replaced ecm, pigtail on transmission speedometer gauge.

    GMC Sierra 1500

    -

    Maintenance & Repair

  • gmc sierra 1500 fuel pump relay location 1 answer

    where is the fuel pump relay on a 2008 sierra 1500 c/cab 4x4

    2008 GMC Sierra 1500

    -

    Maintenance & Repair

  • GMC 1500 Sierra eng 350 1989 1 answer

    I have a GMC 1500 Sierra 1989. When I went to turn my truck off the ignition is stuck it will not turn, but the truck is still running. I can take my key out but the truck will stay running. What is...

    1989 GMC Sierra 1500

    -

    Maintenance & Repair

  • Will the GMC Sierra 2500hd tail light will fit on a GMC Sierra 1500.... Both 2013 1 answer

    Will the GMC Sierra 2500hd tail light will fit on a GMC Sierra 1500.... Both 2013

    2013 GMC Sierra 1500 SLE

    -

    General

Sierra 1500

Looking for a Used Sierra 1500 in your area?

CarGurus has 5,597 nationwide Sierra 1500 listings starting at $4,995.

Postal Code:

Search GMC Sierra 1500 Questions

GMC Sierra 1500 Experts

#1 dragonflyoffshore
dragonflyoffshore
Reputation 4,500
#2 John Saffrahn
John Saffrahn
Reputation 3,150
#3 Glenn Clingenpeel
Glenn Clingenpeel
Reputation 2,750
View All

Related Models For Sale

Used Chevrolet Silverado 1500
106 Great Deals out of 4,755 listings starting at $2,339
Used Ford F-150
463 Great Deals out of 7,072 listings starting at $900
Used Dodge Ram 1500
49 Great Deals out of 447 listings starting at $2,000
Used Toyota Tacoma
36 Great Deals out of 599 listings starting at $3,495
Used GMC Yukon
11 Great Deals out of 422 listings starting at $6,900
Used Chevrolet Tahoe
338 listings starting at $6,477
Used Ford F-250 Super Duty
20 Great Deals out of 422 listings starting at $6,675
Used Chevrolet Camaro
3 Great Deals out of 891 listings starting at $10,995
Used GMC Sierra 2500
11 listings starting at $8,995

Used Cars For Sale

2017 GMC Sierra 1500 For Sale
3,435 listings starting at $30,200
2016 GMC Sierra 1500 For Sale
11 Great Deals out of 510 listings starting at $25,997
2015 GMC Sierra 1500 For Sale
41 Great Deals out of 322 listings starting at $20,910
2014 GMC Sierra 1500 For Sale
33 Great Deals out of 393 listings starting at $21,990
2013 GMC Sierra 1500 For Sale
19 Great Deals out of 281 listings starting at $15,900