I have a 1999 GMC Serria 1500 series truck I took out my 305 engine and put in a 350 engine now it wants to stall

Asked by Mary Jan 18, 2016 at 06:50 AM about the 1999 GMC Sierra 1500 SL 4WD Standard Cab LB

Question type: Maintenance & Repair

I put all most everything new in the motor even a computer and when I did it
runs worst. Please help

1 Answer
223,755

Rowefast answered 8 years ago

I believe it would run some worse since all the computer knows is neutral settings so to speak, and needs time to run its full diagnostics. But seems to be an issue tho. What 350 engine "5.7L" was put in? what year? new or old? The Vortec set-up?

Mark helpful

Your Answer:

Related Questions

Own this car?

Share your experience with others.

1999 GMC Sierra 1500

Write a car review

Review another car

Shortcuts

Search GMC Sierra 1500 Questions

CarGurus Experts

  • #1
    yetilikesbeer
    Reputation
    12,810
  • #2
    dragonflyoffshore
    Reputation
    11,740
  • #3
    John Saffrahn
    Reputation
    11,690
View All

Know more, shop wisely

Search

Related Models For Sale

Used Chevrolet Silverado 1500
4,245 Great Deals out of 122,549 listings starting at $1,999
Used Ford F-150
6,500 Great Deals out of 165,096 listings starting at $1,199
Used Toyota Tundra
1,080 Great Deals out of 31,837 listings starting at $2,999
Used Chevrolet Silverado 2500HD
1,032 Great Deals out of 39,544 listings starting at $4,700
Used GMC Yukon
663 Great Deals out of 15,897 listings starting at $2,500
Used Dodge RAM 1500
56 Great Deals out of 1,382 listings starting at $2,500
Used Toyota Tacoma
2,349 Great Deals out of 55,033 listings starting at $4,995
Used Chevrolet Tahoe
1,352 Great Deals out of 35,008 listings starting at $1,550
Used Ford F-250 Super Duty
1,255 Great Deals out of 50,964 listings starting at $3,000

Used Cars for Sale

2025 GMC Sierra 1500 For Sale
28,671 listings starting at $32,565
2024 GMC Sierra 1500 For Sale
225 Great Deals out of 20,942 listings starting at $25,310
2023 GMC Sierra 1500 For Sale
248 Great Deals out of 3,018 listings starting at $24,998
2022 GMC Sierra 1500 For Sale
154 Great Deals out of 1,828 listings starting at $25,888
2021 GMC Sierra 1500 For Sale
316 Great Deals out of 3,565 listings starting at $19,599

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.