5.7L V8 engine question

Asked by GuruQSTF Apr 27, 2017 at 04:57 PM about the 1999 Chevrolet Silverado 1500 LS Extended Cab LB RWD

Question type: Maintenance & Repair

My friend's 1998 Silverado 1500 usually runs great, but this week it started
starting hard and running rough. I thought gas problem and put seafoam in
tank, no help. I then replaced spark plugs/coil, no help. Do you guys have any
suggestions on what might be the problem?

1 Answer

Have you tried looking for a vacuum leak somewhere? That is what was causing my truck to run so rough.

Your Answer:

Chevrolet Silverado 1500 Experts

  • #1
    Rowefast
    Reputation
    7,030
  • #2
    John Carson
    Reputation
    6,980
  • #3
    Andrew Olsen
    Reputation
    6,550
View All

Find great deals from top-rated dealers

Search

Related Models For Sale

Used GMC Sierra 1500
77 Great Deals out of 7,251 listings starting at $1,188
Used Ford F-150
126 Great Deals out of 10,888 listings starting at $100
Used Chevrolet Silverado 2500HD
9 Great Deals out of 1,574 listings starting at $4,488
Used Dodge RAM 1500
250 listings starting at $5,995
Used Toyota Tundra
27 Great Deals out of 1,045 listings starting at $6,995
Used Toyota Tacoma
34 Great Deals out of 1,494 listings starting at $1,294
Used Chevrolet Tahoe
16 Great Deals out of 522 listings starting at $6,999
Used Chevrolet Camaro
15 Great Deals out of 615 listings starting at $7,800
Used Ford F-250 Super Duty
19 Great Deals out of 800 listings starting at $6,898

Used Cars for Sale

2020 Chevrolet Silverado 1500 For Sale
3 Great Deals out of 3,555 listings starting at $8,675
2019 Chevrolet Silverado 1500 For Sale
12 Great Deals out of 1,841 listings starting at $21,500
2018 Chevrolet Silverado 1500 For Sale
20 Great Deals out of 377 listings starting at $25,991
2017 Chevrolet Silverado 1500 For Sale
19 Great Deals out of 481 listings starting at $22,888
2016 Chevrolet Silverado 1500 For Sale
15 Great Deals out of 213 listings starting at $15,880

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. Content will be removed if CarGurus becomes aware that it violates our policies.