89 gmc sierra bogging down

Asked by Mar 16, 2018 at 10:18 PM about the 1989 GMC Sierra 1500

Question type: General

I have an 89 gmc sierra 5.7L 4x4. Idles excellent
when in park, but when i start driving and give it
gas it almost stalls out, unless i barely feather it or
until i get passed that point and get up to say 30
mph+. Have no speedo so guesssin. Pulled throttle
body off amd apart and cleaned. Changed map
sensor, timing is on, injectors appear to be spraying
great, but notice the ticking from them seems to be
loud. Any ideas please. Been trying to get it on the
road for months.

2 Answers


Check the fuel pressure next. How old is the fuel, you said it has been sitting for months? How long before that?


CEL on? Scan for the OBDii codes.....http://www.mustangandfords.com/how-to/interior- electrical/1510-how-to-manually-test-eec-iv-obd1-trouble-codes-on-a-fox-body-mustang- for-free/

Your Answer:

GMC Sierra 1500 Experts

  • #1
  • #2
    John Saffrahn
  • #3
    Glenn Clingenpeel
View All

Related Models For Sale

Used Ford F-150
122 Great Deals out of 11,236 listings starting at $369
Used Chevrolet Camaro
6 Great Deals out of 1,008 listings starting at $4,500

Used Cars For Sale

2018 GMC Sierra 1500 For Sale
21 Great Deals out of 8,389 listings starting at $22,280
2017 GMC Sierra 1500 For Sale
3 Great Deals out of 571 listings starting at $24,940
2016 GMC Sierra 1500 For Sale
9 Great Deals out of 518 listings starting at $22,750
2015 GMC Sierra 1500 For Sale
12 Great Deals out of 529 listings starting at $19,988
2014 GMC Sierra 1500 For Sale
5 Great Deals out of 305 listings starting at $15,995

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.