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/

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