Engine starts and idles fine, but stumbles when I press on gas, and won't cruise past 100 kph
GMC Q&AAsk Your Question
1999 GMC Yukon Question: Engine loses power when excelorating
Answer #1arturo08 March 24, 2013, 13:52Master
review when last tuned. it may just be due.
try oil stabilize in engine to recondition seals and cylinders. this will enhance compression.
use ethanol treatment on next fill up. this will clean any ethanol resins that may be inhibiting fuel delivery.
do fuel pressure test to check.
run diagnostic to find any other issues you should be aware of.
consider upgrading air filter to high air flow design.